S(x)=7-2x

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Solution for S(x)=7-2x equation: 



(S)=7-2S

We move all terms to the left:

(S)-(7-2S)=0

We add all the numbers together, and all the variables

S-(-2S+7)=0

We get rid of parentheses

S+2S-7=0

We add all the numbers together, and all the variables

3S-7=0

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

3S=7

S=7/3

S=2+1/3

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