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7(-4r-8)=19-3r
We move all terms to the left:
7(-4r-8)-(19-3r)=0
We add all the numbers together, and all the variables
7(-4r-8)-(-3r+19)=0
We multiply parentheses
-28r-(-3r+19)-56=0
We get rid of parentheses
-28r+3r-19-56=0
We add all the numbers together, and all the variables
-25r-75=0
We move all terms containing r to the left, all other terms to the right
-25r=75
r=75/-25
r=-3
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