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-6(5+r)=18
We move all terms to the left:
-6(5+r)-(18)=0
We add all the numbers together, and all the variables
-6(r+5)-18=0
We multiply parentheses
-6r-30-18=0
We add all the numbers together, and all the variables
-6r-48=0
We move all terms containing r to the left, all other terms to the right
-6r=48
r=48/-6
r=-8
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