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s in (-oo:+oo)
-7 = 9-(s/6)-4 // - 9-(s/6)-4
s/6-9-7+4 = 0
1/6*s-12 = 0 // + 12
1/6*s = 12 // : 1/6
s = 12/1/6
s = 72
s = 72
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