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m in (-oo:+oo)
(4/5)*m-3 = (-9/10)*m+2 // - (-9/10)*m+2
(4/5)*m-((-9/10)*m)-3-2 = 0
(4/5)*m+(9/10)*m-3-2 = 0
17/10*m-5 = 0 // + 5
17/10*m = 5 // : 17/10
m = 5/17/10
m = 50/17
m = 50/17
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