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s/4=-2.1
We move all terms to the left:
s/4-(-2.1)=0
We add all the numbers together, and all the variables
s/4+2.1=0
We multiply all the terms by the denominator
s+(2.1)*4=0
We add all the numbers together, and all the variables
s+8.4=0
We move all terms containing s to the left, all other terms to the right
s=-8.4
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