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-9+s/4-3ss=12
We move all terms to the left:
-9+s/4-3ss-(12)=0
We add all the numbers together, and all the variables
s/4-3ss-21=0
We multiply all the terms by the denominator
s-3ss*4-21*4=0
We add all the numbers together, and all the variables
s-3ss*4-84=0
Wy multiply elements
s-12s-84=0
We add all the numbers together, and all the variables
-11s-84=0
We move all terms containing s to the left, all other terms to the right
-11s=84
s=84/-11
s=-7+7/11
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