8(r-4)=40

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Solution for 8(r-4)=40 equation: 


Simplifying
8(r + -4) = 40

Reorder the terms:
8(-4 + r) = 40
(-4 * 8 + r * 8) = 40
(-32 + 8r) = 40

Solving
-32 + 8r = 40

Solving for variable 'r'.

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

Add '32' to each side of the equation.
-32 + 32 + 8r = 40 + 32

Combine like terms: -32 + 32 = 0
0 + 8r = 40 + 32
8r = 40 + 32

Combine like terms: 40 + 32 = 72
8r = 72

Divide each side by '8'.
r = 9

Simplifying
r = 9

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