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-4(r+5)=43
We move all terms to the left:
-4(r+5)-(43)=0
We multiply parentheses
-4r-20-43=0
We add all the numbers together, and all the variables
-4r-63=0
We move all terms containing r to the left, all other terms to the right
-4r=63
r=63/-4
r=-15+3/4
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