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4(r+5)-3=-15
We move all terms to the left:
4(r+5)-3-(-15)=0
We add all the numbers together, and all the variables
4(r+5)+12=0
We multiply parentheses
4r+20+12=0
We add all the numbers together, and all the variables
4r+32=0
We move all terms containing r to the left, all other terms to the right
4r=-32
r=-32/4
r=-8
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