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m in (-oo:+oo)
(4/7)*m-((1/2)*m)-7 = -103/14 // + -103/14
(4/7)*m-((1/2)*m)-(-103/14)-7 = 0
(4/7)*m+(-1/2)*m+103/14-7 = 0
1/14*m+5/14 = 0 // - 5/14
1/14*m = -5/14 // : 1/14
m = -5/14/1/14
m = -5
m = -5
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