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M in (-oo:+oo)
M/4+4 = 7/4 // - 7/4
M/4-(7/4)+4 = 0
M/4-7/4+4 = 0
1/4*M+9/4 = 0 // - 9/4
1/4*M = -9/4 // : 1/4
M = -9/4/1/4
M = -9
M = -9
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