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88=4(r-70)
We move all terms to the left:
88-(4(r-70))=0
We calculate terms in parentheses: -(4(r-70)), so:We get rid of parentheses
4(r-70)
We multiply parentheses
4r-280
Back to the equation:
-(4r-280)
-4r+280+88=0
We add all the numbers together, and all the variables
-4r+368=0
We move all terms containing r to the left, all other terms to the right
-4r=-368
r=-368/-4
r=+92
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