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-3(r-7)-4(-7r-8)=28
We move all terms to the left:
-3(r-7)-4(-7r-8)-(28)=0
We multiply parentheses
-3r+28r+21+32-28=0
We add all the numbers together, and all the variables
25r+25=0
We move all terms containing r to the left, all other terms to the right
25r=-25
r=-25/25
r=-1
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