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2.2(10.5r-3.4)=88
We move all terms to the left:
2.2(10.5r-3.4)-(88)=0
We multiply parentheses
22r-7.48-88=0
We add all the numbers together, and all the variables
22r-95.48=0
We move all terms containing r to the left, all other terms to the right
22r=95.48
r=95.48/22
r=4+5.054054054054/14.864864864865
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