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4.21=2.98+s4.21=2.98+s
We move all terms to the left:
4.21-(2.98+s4.21)=0
We add all the numbers together, and all the variables
-(s4.21+2.98)+4.21=0
We get rid of parentheses
-s4.21-2.98+4.21=0
We add all the numbers together, and all the variables
-s4.21+1.23=0
We move all terms containing s to the left, all other terms to the right
-s4.21=-1.23
s=-1.23/1
s=-1.23
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