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73=3(2r+5)-2(r-5)
We move all terms to the left:
73-(3(2r+5)-2(r-5))=0
We calculate terms in parentheses: -(3(2r+5)-2(r-5)), so:We get rid of parentheses
3(2r+5)-2(r-5)
We multiply parentheses
6r-2r+15+10
We add all the numbers together, and all the variables
4r+25
Back to the equation:
-(4r+25)
-4r-25+73=0
We add all the numbers together, and all the variables
-4r+48=0
We move all terms containing r to the left, all other terms to the right
-4r=-48
r=-48/-4
r=+12
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