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m in (-oo:+oo)
(1/4)*m-(4*m)-(5/9) = -140/9 // + -140/9
(1/4)*m-(4*m)-(5/9)-(-140/9) = 0
(1/4)*m-4*m-5/9+140/9 = 0
15-15/4*m = 0 // - 15
-15/4*m = -15 // : -15/4
m = -15/(-15/4)
m = 4
m = 4
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