12+4(r+5)+4r=88

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Solution for 12+4(r+5)+4r=88 equation: 



12+4(r+5)+4r=88

We move all terms to the left:

12+4(r+5)+4r-(88)=0

We add all the numbers together, and all the variables

4r+4(r+5)-76=0

We multiply parentheses

4r+4r+20-76=0

We add all the numbers together, and all the variables

8r-56=0

We move all terms containing r to the left, all other terms to the right

8r=56

r=56/8

r=7

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