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x in (-oo:+oo)
x+7 = (1/2)*(4*x-s) // - (1/2)*(4*x-s)
x-((1/2)*(4*x-s))+7 = 0
(-1/2)*(4*x-s)+x+7 = 0
x-1/2*(4*x-s)+7 = 0
x-1/2*(4*x-s)+7 = 0
1/2*s-x+7 = 0
1/2*s-x+7 = 0
1/2*s-x+7 = 0 // - 1/2*s+7
-x = -(1/2*s+7) // * -1
x = 1/2*s+7
x = 1/2*s+7
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