8r-12=40

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Solution for 8r-12=40 equation: 


Simplifying
8r + -12 = 40

Reorder the terms:
-12 + 8r = 40

Solving
-12 + 8r = 40

Solving for variable 'r'.

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

Add '12' to each side of the equation.
-12 + 12 + 8r = 40 + 12

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

Combine like terms: 40 + 12 = 52
8r = 52

Divide each side by '8'.
r = 6.5

Simplifying
r = 6.5

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