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4r+2(+)5r-12=125
We move all terms to the left:
4r+2(+)5r-12-(125)=0
We add all the numbers together, and all the variables
4r+205r-12-125=0
We add all the numbers together, and all the variables
209r-137=0
We move all terms containing r to the left, all other terms to the right
209r=137
r=137/209
r=137/209
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