x+21=3x-7

Simple and best practice solution for x+21=3x-7 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 x+21=3x-7 equation:


Simplifying
x + 21 = 3x + -7

Reorder the terms:
21 + x = 3x + -7

Reorder the terms:
21 + x = -7 + 3x

Solving
21 + x = -7 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + x + -3x = -7 + 3x + -3x

Combine like terms: x + -3x = -2x
21 + -2x = -7 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -2x = -7 + 0
21 + -2x = -7

Add '-21' to each side of the equation.
21 + -21 + -2x = -7 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = -7 + -21
-2x = -7 + -21

Combine like terms: -7 + -21 = -28
-2x = -28

Divide each side by '-2'.
x = 14

Simplifying
x = 14

See similar equations:

| ax+8=6x+b | | ln(2x+1)+ln(x-8)-2lnx=0 | | 11([w-7]/2)-20=101 | | 2(2x+1)=3-8 | | 3(2x-6)=3-4(3-x) | | 6x^4+3x^3+10x+5=0 | | -12.4f=6.1f+74.8 | | -6(3-4x)+2x=8(x+11) | | 6=-8y | | 1/3-15/49x=16/49-1/21x | | (28+x).6=306 | | 7(-3x)=2(8x-9)+6 | | 2x^2+6x-x-3= | | 9=w-11 | | 3x+3=7x+11 | | 4(3x-2.1)=7x-8.4 | | 7x^2+x^2+12=0 | | 7m-3p=20 | | 8=64+x/360 | | y=17x+9 | | 14.3+2c=-c+4.9 | | 8(6x+2)=5(x-2) | | 4(2-3)=8(2x+5) | | 3n+8=-1 | | 2x+8=10x-10 | | 6+78x=52x+22 | | 5a^2+26ab+5b^2=0 | | 1.44+x=2 | | (lnx)=6+lnx | | -4cos(x-pi/6) | | 4n+.5n+n+n= | | x*10+12=x*6+120 |

Equations solver categories