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21+6r=3r+3(7r-5)
We move all terms to the left:
21+6r-(3r+3(7r-5))=0
We calculate terms in parentheses: -(3r+3(7r-5)), so:We get rid of parentheses
3r+3(7r-5)
We multiply parentheses
3r+21r-15
We add all the numbers together, and all the variables
24r-15
Back to the equation:
-(24r-15)
6r-24r+15+21=0
We add all the numbers together, and all the variables
-18r+36=0
We move all terms containing r to the left, all other terms to the right
-18r=-36
r=-36/-18
r=+2
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