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M in (-oo:+oo)
M/5 = -18/1 // + -18/1
M/5-(-18/1) = 0
M/5+18 = 0
1/5*M+18 = 0 // - 18
1/5*M = -18 // : 1/5
M = -18/1/5
M = -90
M = -90
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