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-4(r+r)=-70
We move all terms to the left:
-4(r+r)-(-70)=0
We add all the numbers together, and all the variables
-4(+2r)-(-70)=0
We add all the numbers together, and all the variables
-4(+2r)+70=0
We multiply parentheses
-8r+70=0
We move all terms containing r to the left, all other terms to the right
-8r=-70
r=-70/-8
r=8+3/4
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