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-9=4(s+7)-13
We move all terms to the left:
-9-(4(s+7)-13)=0
We calculate terms in parentheses: -(4(s+7)-13), so:We get rid of parentheses
4(s+7)-13
We multiply parentheses
4s+28-13
We add all the numbers together, and all the variables
4s+15
Back to the equation:
-(4s+15)
-4s-15-9=0
We add all the numbers together, and all the variables
-4s-24=0
We move all terms containing s to the left, all other terms to the right
-4s=24
s=24/-4
s=-6
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