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(4+s)9=63
We move all terms to the left:
(4+s)9-(63)=0
We add all the numbers together, and all the variables
(s+4)9-63=0
We multiply parentheses
9s+36-63=0
We add all the numbers together, and all the variables
9s-27=0
We move all terms containing s to the left, all other terms to the right
9s=27
s=27/9
s=3
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