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(180-40)/4=s
We move all terms to the left:
(180-40)/4-(s)=0
We add all the numbers together, and all the variables
-s+140/4=0
We add all the numbers together, and all the variables
-1s+35=0
We move all terms containing s to the left, all other terms to the right
-s=-35
s=-35/-1
s=+35
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