S(x)=x+(40-x)

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Solution for S(x)=x+(40-x) equation: 



(S)=S+(40-S)

We move all terms to the left:

(S)-(S+(40-S))=0

We add all the numbers together, and all the variables

S-(S+(-1S+40))=0



We calculate terms in parentheses: -(S+(-1S+40)), so:

S+(-1S+40)

We get rid of parentheses

S-1S+40

We add all the numbers together, and all the variables

40

Back to the equation:

-(40)



We move all terms containing S to the left, all other terms to the right

S=40

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