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1/2(4s+12)=-5s=30
We move all terms to the left:
1/2(4s+12)-(-5s)=0
Domain of the equation: 2(4s+12)!=0We get rid of parentheses
s∈R
1/2(4s+12)+5s=0
We multiply all the terms by the denominator
5s*2(4s+12)+1=0
Wy multiply elements
10s^2(4+1=0
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