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4(2r+5)=2(10r-14)
We move all terms to the left:
4(2r+5)-(2(10r-14))=0
We multiply parentheses
8r-(2(10r-14))+20=0
We calculate terms in parentheses: -(2(10r-14)), so:We get rid of parentheses
2(10r-14)
We multiply parentheses
20r-28
Back to the equation:
-(20r-28)
8r-20r+28+20=0
We add all the numbers together, and all the variables
-12r+48=0
We move all terms containing r to the left, all other terms to the right
-12r=-48
r=-48/-12
r=+4
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