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18/s=4
We move all terms to the left:
18/s-(4)=0
Domain of the equation: s!=0We multiply all the terms by the denominator
s∈R
-4*s+18=0
We add all the numbers together, and all the variables
-4s+18=0
We move all terms containing s to the left, all other terms to the right
-4s=-18
s=-18/-4
s=4+1/2
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