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m in (-oo:+oo)
(-1/3)*m-4 = (6/7)*m-(856/189) // - (6/7)*m-(856/189)
(-1/3)*m-((6/7)*m)+856/189-4 = 0
(-1/3)*m+(-6/7)*m+856/189-4 = 0
100/189-25/21*m = 0 // - 100/189
-25/21*m = -100/189 // : -25/21
m = -100/189/(-25/21)
m = 4/9
m = 4/9
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