r+(r+10)=100

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Solution for r+(r+10)=100 equation: 



r+(r+10)=100

We move all terms to the left:

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

We get rid of parentheses

r+r+10-100=0

We add all the numbers together, and all the variables

2r-90=0

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

2r=90

r=90/2

r=45

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