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M in (-oo:+oo)
M-(-7/10) = (-1/1)/5 // - (-1/1)/5
M-(-7/10)-((-1/1)/5) = 0
M+7/10+1/5 = 0
M+9/10 = 0 // - 9/10
M = -9/10
M = -9/10
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