12r-8=40

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Solution for 12r-8=40 equation: 


Simplifying
12r + -8 = 40

Reorder the terms:
-8 + 12r = 40

Solving
-8 + 12r = 40

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 + 12r = 40 + 8

Combine like terms: -8 + 8 = 0
0 + 12r = 40 + 8
12r = 40 + 8

Combine like terms: 40 + 8 = 48
12r = 48

Divide each side by '12'.
r = 4

Simplifying
r = 4

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