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7s+4(3-s)=-1
We move all terms to the left:
7s+4(3-s)-(-1)=0
We add all the numbers together, and all the variables
7s+4(-1s+3)-(-1)=0
We add all the numbers together, and all the variables
7s+4(-1s+3)+1=0
We multiply parentheses
7s-4s+12+1=0
We add all the numbers together, and all the variables
3s+13=0
We move all terms containing s to the left, all other terms to the right
3s=-13
s=-13/3
s=-4+1/3
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