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-100=7r-4(3-r)
We move all terms to the left:
-100-(7r-4(3-r))=0
We add all the numbers together, and all the variables
-(7r-4(-1r+3))-100=0
We calculate terms in parentheses: -(7r-4(-1r+3)), so:We get rid of parentheses
7r-4(-1r+3)
We multiply parentheses
7r+4r-12
We add all the numbers together, and all the variables
11r-12
Back to the equation:
-(11r-12)
-11r+12-100=0
We add all the numbers together, and all the variables
-11r-88=0
We move all terms containing r to the left, all other terms to the right
-11r=88
r=88/-11
r=-8
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