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-4(r+3)=75
We move all terms to the left:
-4(r+3)-(75)=0
We multiply parentheses
-4r-12-75=0
We add all the numbers together, and all the variables
-4r-87=0
We move all terms containing r to the left, all other terms to the right
-4r=87
r=87/-4
r=-21+3/4
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