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5(r-10)=(-51)
We move all terms to the left:
5(r-10)-((-51))=0
We add all the numbers together, and all the variables
5(r-10)+51=0
We multiply parentheses
5r-50+51=0
We add all the numbers together, and all the variables
5r+1=0
We move all terms containing r to the left, all other terms to the right
5r=-1
r=-1/5
r=-1/5
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