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4r-11=4(5+r)-31
We move all terms to the left:
4r-11-(4(5+r)-31)=0
We add all the numbers together, and all the variables
4r-(4(r+5)-31)-11=0
We calculate terms in parentheses: -(4(r+5)-31), so:We get rid of parentheses
4(r+5)-31
We multiply parentheses
4r+20-31
We add all the numbers together, and all the variables
4r-11
Back to the equation:
-(4r-11)
4r-4r+11-11=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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