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20+120/s=40
We move all terms to the left:
20+120/s-(40)=0
Domain of the equation: s!=0We add all the numbers together, and all the variables
s∈R
120/s-20=0
We multiply all the terms by the denominator
-20*s+120=0
We add all the numbers together, and all the variables
-20s+120=0
We move all terms containing s to the left, all other terms to the right
-20s=-120
s=-120/-20
s=+6
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