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2(264-s)+3s=642
We move all terms to the left:
2(264-s)+3s-(642)=0
We add all the numbers together, and all the variables
2(-1s+264)+3s-642=0
We add all the numbers together, and all the variables
3s+2(-1s+264)-642=0
We multiply parentheses
3s-2s+528-642=0
We add all the numbers together, and all the variables
s-114=0
We move all terms containing s to the left, all other terms to the right
s=114
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