4(r+5)=12

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Solution for 4(r+5)=12 equation: 


Simplifying
4(r + 5) = 12

Reorder the terms:
4(5 + r) = 12
(5 * 4 + r * 4) = 12
(20 + 4r) = 12

Solving
20 + 4r = 12

Solving for variable 'r'.

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

Add '-20' to each side of the equation.
20 + -20 + 4r = 12 + -20

Combine like terms: 20 + -20 = 0
0 + 4r = 12 + -20
4r = 12 + -20

Combine like terms: 12 + -20 = -8
4r = -8

Divide each side by '4'.
r = -2

Simplifying
r = -2

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