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2s+4=4(s+9)
We move all terms to the left:
2s+4-(4(s+9))=0
We calculate terms in parentheses: -(4(s+9)), so:We get rid of parentheses
4(s+9)
We multiply parentheses
4s+36
Back to the equation:
-(4s+36)
2s-4s-36+4=0
We add all the numbers together, and all the variables
-2s-32=0
We move all terms containing s to the left, all other terms to the right
-2s=32
s=32/-2
s=-16
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