10(r-7)=-100

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Solution for 10(r-7)=-100 equation: 



10(r-7)=-100

We move all terms to the left:

10(r-7)-(-100)=0

We add all the numbers together, and all the variables

10(r-7)+100=0

We multiply parentheses

10r-70+100=0

We add all the numbers together, and all the variables

10r+30=0

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

10r=-30

r=-30/10

r=-3

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