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7(8r+7)=-175
We move all terms to the left:
7(8r+7)-(-175)=0
We add all the numbers together, and all the variables
7(8r+7)+175=0
We multiply parentheses
56r+49+175=0
We add all the numbers together, and all the variables
56r+224=0
We move all terms containing r to the left, all other terms to the right
56r=-224
r=-224/56
r=-4
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