-5(1-7r)=100

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Solution for -5(1-7r)=100 equation: 



-5(1-7r)=100

We move all terms to the left:

-5(1-7r)-(100)=0

We add all the numbers together, and all the variables

-5(-7r+1)-100=0

We multiply parentheses

35r-5-100=0

We add all the numbers together, and all the variables

35r-105=0

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

35r=105

r=105/35

r=3

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