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6(3r+4)=-120
We move all terms to the left:
6(3r+4)-(-120)=0
We add all the numbers together, and all the variables
6(3r+4)+120=0
We multiply parentheses
18r+24+120=0
We add all the numbers together, and all the variables
18r+144=0
We move all terms containing r to the left, all other terms to the right
18r=-144
r=-144/18
r=-8
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