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m in (-oo:+oo)
(5/6)*m+(3/4)*m+4/7 = 1511/84 // - 1511/84
(5/6)*m+(3/4)*m+4/7-(1511/84) = 0
(5/6)*m+(3/4)*m+4/7-1511/84 = 0
19/12*m-209/12 = 0 // + 209/12
19/12*m = 209/12 // : 19/12
m = 209/12/19/12
m = 11
m = 11
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