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10=10(2r-9)
We move all terms to the left:
10-(10(2r-9))=0
We calculate terms in parentheses: -(10(2r-9)), so:We get rid of parentheses
10(2r-9)
We multiply parentheses
20r-90
Back to the equation:
-(20r-90)
-20r+90+10=0
We add all the numbers together, and all the variables
-20r+100=0
We move all terms containing r to the left, all other terms to the right
-20r=-100
r=-100/-20
r=+5
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