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s in (-oo:+oo)
(3/4)*(s+7) = 15 // - 15
(3/4)*(s+7)-15 = 0
3/4*(s+7)-15 = 0
3/4*(s+7)-15 = 0
3/4*s-39/4 = 0
3/4*s-39/4 = 0
3/4*s-39/4 = 0 // + 39/4
3/4*s = 39/4 // : 3/4
s = 39/4/3/4
s = 13
s = 13
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