4r+12=40

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Solution for 4r+12=40 equation: 


Simplifying
4r + 12 = 40

Reorder the terms:
12 + 4r = 40

Solving
12 + 4r = 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 + 4r = 40 + -12

Combine like terms: 12 + -12 = 0
0 + 4r = 40 + -12
4r = 40 + -12

Combine like terms: 40 + -12 = 28
4r = 28

Divide each side by '4'.
r = 7

Simplifying
r = 7

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