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m in (-oo:+oo)
4*m+(4/5)*m-(2/3) = -34/15 // + -34/15
4*m+(4/5)*m-(2/3)-(-34/15) = 0
4*m+(4/5)*m-2/3+34/15 = 0
24/5*m+8/5 = 0 // - 8/5
24/5*m = -8/5 // : 24/5
m = -8/5/24/5
m = -1/3
m = -1/3
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