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7.5-0.9r=-8.52
We move all terms to the left:
7.5-0.9r-(-8.52)=0
We add all the numbers together, and all the variables
-0.9r+16.02=0
We move all terms containing r to the left, all other terms to the right
-0.9r=-16.02
r=-16.02/-0.9
r=17+0.72/0.9
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