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4r+3(10-r)=37
We move all terms to the left:
4r+3(10-r)-(37)=0
We add all the numbers together, and all the variables
4r+3(-1r+10)-37=0
We multiply parentheses
4r-3r+30-37=0
We add all the numbers together, and all the variables
r-7=0
We move all terms containing r to the left, all other terms to the right
r=7
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