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-4s+2(-4s+1)=125
We move all terms to the left:
-4s+2(-4s+1)-(125)=0
We multiply parentheses
-4s-8s+2-125=0
We add all the numbers together, and all the variables
-12s-123=0
We move all terms containing s to the left, all other terms to the right
-12s=123
s=123/-12
s=-10+1/4
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