2r+8=21

Simple and best practice solution for 2r+8=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 2r+8=21 equation: 


Simplifying
2r + 8 = 21

Reorder the terms:
8 + 2r = 21

Solving
8 + 2r = 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 + 2r = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 2r = 21 + -8
2r = 21 + -8

Combine like terms: 21 + -8 = 13
2r = 13

Divide each side by '2'.
r = 6.5

Simplifying
r = 6.5

See similar equations:

| 5n-(8n-2)=-31 | | 3x+20=4x-7 | | 6.4=5e^2x | | 4(x+8)-3x=42 | | 2/3x+4=5+7 | | 105+2x-5=180 | | 4(x+8)-8x=42 | | 2x+38=4x-10 | | [2(y+5)-5]+9=5(y-1) | | 3x(n-1.8)=2n-(5-2n)+4 | | 5x-5=2x+3 | | 4a+6a+3-3=15 | | 2(a-x)(2x-6)= | | Sen(4x)=0 | | 6c-de= | | 7x-10=9x-6 | | X+8x^3=0 | | 5-7x=6x^2 | | 6a(8a+4y)= | | 4x(x+2)-8=3(x^2+4) | | B-6=-6+2 | | 4x^2-9x+9=2x+2 | | 8p+11=-5 | | (5-4i)(2+3i)= | | Y+5=-3(x-6) | | 262-(-35)= | | ln(10-3x)-2lnx=0 | | -2x^2-3= | | 3.6x-30=6 | | -6x^2(-7x^2+x-3)= | | 6a+-12a= | | 28.5w=37.8 |

Equations solver categories