-21=9+2r

Simple and best practice solution for -21=9+2r 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=9+2r equation: 



-21=9+2r

We move all terms to the left:

-21-(9+2r)=0

We add all the numbers together, and all the variables

-(2r+9)-21=0

We get rid of parentheses

-2r-9-21=0

We add all the numbers together, and all the variables

-2r-30=0

We move all terms containing r to the left, all other terms to the right

-2r=30

r=30/-2

r=-15

See similar equations:

| 10(x-2)+4=12(x+6)-6 | | 48=6w w= | | -x+34=214 | | 45x^2+21x-90=0 | | 45x^2+21x=90 | | -4r-1=-77 | | 4=-w+156 | | 35+8x+7=90 | | 3x-5=8x=10 | | -9=1/2z-11 | | 35+8x+7=180 | | 1210+x=5(1/5x+2) | | -4(3x)=18 | | 77+52+x+56=180 | | 13x-8+11x=24x-16+22x | | 3(n+5)-4n=39-7n | | 13x-8+11x=24x-16+21x | | 13x-8+11x=24x-16+16 | | 13x-8+11x=24x-16+8 | | 93x+41+52=180 | | 61+75+4x+4=180 | | 4-3(x-1)=2x-28 | | -49=7(x+1) | | -40+4n=4(3n+2) | | 5u+5=3 | | -8y+18=26 | | 13x+2+56+70=180 | | 8x-4+80=180 | | 2(p+6)=14 | | -75=5(-5-2m) | | 4x+2.5+2.5+3+3=2x+2.5+3+3+3 | | -2(18r–6)–10=8r+2 |

Equations solver categories