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M in (-oo:+oo)
M/6-1.5 = -7 // + 7
M/6-1.5+7 = 0
1/6*M+5.5 = 0 // - 5.5
1/6*M = -5.5 // : 1/6
M = -5.5/1/6
M = -32.99999934
M = -32.99999934
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