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8.52=-0.3r
We move all terms to the left:
8.52-(-0.3r)=0
We get rid of parentheses
0.3r+8.52=0
We move all terms containing r to the left, all other terms to the right
0.3r=-8.52
r=-8.52/0.3
r=-28+0.12/0.3
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