-42=7a+21

Simple and best practice solution for -42=7a+21 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 -42=7a+21 equation:


Simplifying
-42 = 7a + 21

Reorder the terms:
-42 = 21 + 7a

Solving
-42 = 21 + 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
-42 + -7a = 21 + 7a + -7a

Combine like terms: 7a + -7a = 0
-42 + -7a = 21 + 0
-42 + -7a = 21

Add '42' to each side of the equation.
-42 + 42 + -7a = 21 + 42

Combine like terms: -42 + 42 = 0
0 + -7a = 21 + 42
-7a = 21 + 42

Combine like terms: 21 + 42 = 63
-7a = 63

Divide each side by '-7'.
a = -9

Simplifying
a = -9

See similar equations:

| 2y-5y-9+2=31 | | 322550=x+x+162650 | | (9x-1)+(5x-17)=24 | | -65=13 | | 1.5x-3.6=2.4x+4.5 | | 358=20(273+t) | | 24+12x+20=4x+120-40 | | 3*(x-17)=21 | | 7y+9=15y+9 | | -x^2+17x-24=0 | | 322550=x+162650x | | 2(x+x+.5)=9.8 | | x-35+x+x+5=180 | | (6x-8)+(14x-7)=73 | | 4-3x=14+2x | | 18m-3=12m+2 | | -3x-21x= | | 6x+7=-131 | | 0.5(4x+6)=0.33(9x-24) | | 4x+6=6x-14 | | 8x+32=4x+8 | | (7x-10)-(-6x+8)= | | 52x=208 | | 8*-1=m | | 121x^2-132x-27=0 | | x^4+8x^3+15x^2-8x-16=0 | | 14d+30=-196 | | 168=x+3x | | 3x+9=4x-2 | | 2(x-5)+5x=88 | | x^3-6x^2-24x-9=0 | | 6qr-10t=5u |

Equations solver categories