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70=8r+6
We move all terms to the left:
70-(8r+6)=0
We get rid of parentheses
-8r-6+70=0
We add all the numbers together, and all the variables
-8r+64=0
We move all terms containing r to the left, all other terms to the right
-8r=-64
r=-64/-8
r=+8
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