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M in (-oo:+oo)
4*M-(5/5) = 6*M+8/7 // - 6*M+8/7
4*M-(6*M)-(5/5)-(8/7) = 0
4*M-6*M-8/7-1 = 0
-2*M-15/7 = 0 // + 15/7
-2*M = 15/7 // : -2
M = 15/7/(-2)
M = -15/14
M = -15/14
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