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-4(r+9)=78
We move all terms to the left:
-4(r+9)-(78)=0
We multiply parentheses
-4r-36-78=0
We add all the numbers together, and all the variables
-4r-114=0
We move all terms containing r to the left, all other terms to the right
-4r=114
r=114/-4
r=-28+1/2
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