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m in (-oo:+oo)
(2/7)*m-1/4 = 127/84-5*m // - 127/84-5*m
(2/7)*m-(-5*m)-1/4-(127/84) = 0
(2/7)*m+5*m-1/4-127/84 = 0
37/7*m-37/21 = 0 // + 37/21
37/7*m = 37/21 // : 37/7
m = 37/21/37/7
m = 1/3
m = 1/3
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