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m in (-oo:+oo)
4*m-(6/5) = -2 // + 2
4*m-(6/5)+2 = 0
4*m-6/5+2 = 0
4*m+4/5 = 0 // - 4/5
4*m = -4/5 // : 4
m = -4/5/4
m = -1/5
m = -1/5
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