8+r=21

Simple and best practice solution for 8+r=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 8+r=21 equation: 


Simplifying
8 + r = 21

Solving
8 + r = 21

Solving for variable 'r'.

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

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

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

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

Simplifying
r = 13

See similar equations:

| X/18.7=0.60913044838 | | -4(x-4)-29=-13 | | 13+n=-2 | | 3r-6=6+r | | 6x^2-7x=11 | | 3(-4-2v)-3v=-66 | | v+17=2 | | 10x+8=12x-32 | | -13+m=-26 | | a-8=16-7a | | 61-7x=2x+19 | | 7x+16x=14x+126 | | 8+a=-1 | | 5x+2=7-4x | | 20+a=8 | | 7-8m+5m=16 | | -28+7x+8m-4x-5m-24= | | 5(6n+4)=170 | | 5r=14 | | 4+v=17 | | -6.3N=-7.19 | | 124=-7-4(x-9) | | 5+b=-10 | | 6(5-8v)+12=-5 | | 5x+23=13x-47 | | 6ln(x)+7ln(z)= | | 6lnx+7lnz= | | k+20=10 | | 9+p=10 | | 1-3x+2x=4 | | +8=14.1 | | x-3/7=x-3/5 |

Equations solver categories