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s in (-oo:+oo)
-((1/4)*s)-13 = 7 // - 7
-((1/4)*s)-13-7 = 0
(-1/4)*s-13-7 = 0
-1/4*s-20 = 0 // + 20
-1/4*s = 20 // : -1/4
s = 20/(-1/4)
s = -80
s = -80
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