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120/(s+40)=2
We move all terms to the left:
120/(s+40)-(2)=0
Domain of the equation: (s+40)!=0We multiply all the terms by the denominator
We move all terms containing s to the left, all other terms to the right
s!=-40
s∈R
-2*(s+40)+120=0
We multiply parentheses
-2s-80+120=0
We add all the numbers together, and all the variables
-2s+40=0
We move all terms containing s to the left, all other terms to the right
-2s=-40
s=-40/-2
s=+20
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