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m in (-oo:+oo)
(5/7)*m+(1/3)*m-6 = -38/7 // + -38/7
(5/7)*m+(1/3)*m-(-38/7)-6 = 0
(5/7)*m+(1/3)*m+38/7-6 = 0
22/21*m-4/7 = 0 // + 4/7
22/21*m = 4/7 // : 22/21
m = 4/7/22/21
m = 6/11
m = 6/11
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