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5(r+5)=-10
We move all terms to the left:
5(r+5)-(-10)=0
We add all the numbers together, and all the variables
5(r+5)+10=0
We multiply parentheses
5r+25+10=0
We add all the numbers together, and all the variables
5r+35=0
We move all terms containing r to the left, all other terms to the right
5r=-35
r=-35/5
r=-7
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