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s in (-oo:+oo)
-7 = -(s/6)-9-4 // + -(s/6)-9-4
s/6-7+4+9 = 0
1/6*s+6 = 0 // - 6
1/6*s = -6 // : 1/6
s = -6/1/6
s = -36
s = -36
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