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64=20+4s
We move all terms to the left:
64-(20+4s)=0
We add all the numbers together, and all the variables
-(4s+20)+64=0
We get rid of parentheses
-4s-20+64=0
We add all the numbers together, and all the variables
-4s+44=0
We move all terms containing s to the left, all other terms to the right
-4s=-44
s=-44/-4
s=+11
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