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-3=4(r+8)-7
We move all terms to the left:
-3-(4(r+8)-7)=0
We calculate terms in parentheses: -(4(r+8)-7), so:We get rid of parentheses
4(r+8)-7
We multiply parentheses
4r+32-7
We add all the numbers together, and all the variables
4r+25
Back to the equation:
-(4r+25)
-4r-25-3=0
We add all the numbers together, and all the variables
-4r-28=0
We move all terms containing r to the left, all other terms to the right
-4r=28
r=28/-4
r=-7
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