21-3(x-7)=x+20

Simple and best practice solution for 21-3(x-7)=x+20 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 21-3(x-7)=x+20 equation:


Simplifying
21 + -3(x + -7) = x + 20

Reorder the terms:
21 + -3(-7 + x) = x + 20
21 + (-7 * -3 + x * -3) = x + 20
21 + (21 + -3x) = x + 20

Combine like terms: 21 + 21 = 42
42 + -3x = x + 20

Reorder the terms:
42 + -3x = 20 + x

Solving
42 + -3x = 20 + x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
42 + -3x + -1x = 20 + x + -1x

Combine like terms: -3x + -1x = -4x
42 + -4x = 20 + x + -1x

Combine like terms: x + -1x = 0
42 + -4x = 20 + 0
42 + -4x = 20

Add '-42' to each side of the equation.
42 + -42 + -4x = 20 + -42

Combine like terms: 42 + -42 = 0
0 + -4x = 20 + -42
-4x = 20 + -42

Combine like terms: 20 + -42 = -22
-4x = -22

Divide each side by '-4'.
x = 5.5

Simplifying
x = 5.5

See similar equations:

| 4x^4-12x^3+11x^2-3x-6006=0 | | 3y^2-2y-504=0 | | -9x-5x+8x=-36 | | 0.4x-0.2(30+x)=0.2(30) | | -y^2=-6 | | y-8=2/3(x-4) | | 32*82x+1=256 | | 3170+250+x=1.85x | | -8x-7x-3x=-54 | | 3170+250+x=1.8x | | 320+250+x=1.2x | | 2a+5b-6=0 | | 1/4k | | 320+250+x=1.4x | | 4c^2-18c=0 | | 1525+250+x=1.8x | | 19x+28=18x+63 | | 360+250+x=1.4x | | 7f-4=38 | | 390+250+x=1.65x | | 8c^-3u^-5/16c^8u^-9 | | 8c^-3u-5/16c^8u^-9 | | 3x+1=3x+18 | | 360+250+x=1.7x | | 8z+6-z=4+3z+2 | | 4p+p^2=12 | | 3x/7=2x/3-1/3 | | 840+250+x=1.32x | | 3s^2+6=3s+12 | | 840+250+x=1.34x | | 1644+250+x=1.55x | | 0.25p^2+2p=3 |

Equations solver categories