4(r+13)=100

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Solution for 4(r+13)=100 equation: 



4(r+13)=100

We move all terms to the left:

4(r+13)-(100)=0

We multiply parentheses

4r+52-100=0

We add all the numbers together, and all the variables

4r-48=0

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

4r=48

r=48/4

r=12

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