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-9s+70=2(-s+28)
We move all terms to the left:
-9s+70-(2(-s+28))=0
We add all the numbers together, and all the variables
-9s-(2(-1s+28))+70=0
We calculate terms in parentheses: -(2(-1s+28)), so:We get rid of parentheses
2(-1s+28)
We multiply parentheses
-2s+56
Back to the equation:
-(-2s+56)
-9s+2s-56+70=0
We add all the numbers together, and all the variables
-7s+14=0
We move all terms containing s to the left, all other terms to the right
-7s=-14
s=-14/-7
s=+2
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