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(1+4s)(3)=
We move all terms to the left:
(1+4s)(3)-()=0
We add all the numbers together, and all the variables
(4s+1)3-()=0
We add all the numbers together, and all the variables
(4s+1)3=0
We multiply parentheses
12s+3=0
We move all terms containing s to the left, all other terms to the right
12s=-3
s=-3/12
s=-1/4
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