12r-8=-3r-21

Simple and best practice solution for 12r-8=-3r-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 12r-8=-3r-21 equation:


Simplifying
12r + -8 = -3r + -21

Reorder the terms:
-8 + 12r = -3r + -21

Reorder the terms:
-8 + 12r = -21 + -3r

Solving
-8 + 12r = -21 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
-8 + 12r + 3r = -21 + -3r + 3r

Combine like terms: 12r + 3r = 15r
-8 + 15r = -21 + -3r + 3r

Combine like terms: -3r + 3r = 0
-8 + 15r = -21 + 0
-8 + 15r = -21

Add '8' to each side of the equation.
-8 + 8 + 15r = -21 + 8

Combine like terms: -8 + 8 = 0
0 + 15r = -21 + 8
15r = -21 + 8

Combine like terms: -21 + 8 = -13
15r = -13

Divide each side by '15'.
r = -0.8666666667

Simplifying
r = -0.8666666667

See similar equations:

| 8*(-12)=-96 | | 3(x-4)-(x+9)+25(-y-x)= | | 7z+z=7z-8 | | 39=-w/7 | | 8x(-12)=-96 | | -133=-7(1+3v) | | 3=3n-1-4n | | K/6=4/4 | | -w/7=-48 | | 6(z+3)-(-2z-2)=7z | | 3x*x+2*(-2x)+3-x*2x-3*(-x)-3= | | g=2+-9x-1 | | 12/35*11/63 | | 16=-15x+3x-2 | | 4/7*3/5 | | 11+2n=5 | | 7k+2-3k=22+8k | | 10x+y=270 | | 25+0.30x=50 | | 8w-15= | | 9x+16=7x+15 | | -84*1=-84 | | (7x+3)(7x-3)=0 | | 18w-1= | | 4x-5=(-29) | | 44=4w-12 | | u/3-15=16 | | ((33-x)/(5x))-2 | | 7/10-3/25 | | 7x=2(2y+1)+13 | | 180-x+50= | | 7/70-3/25 |

Equations solver categories