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m in (-oo:+oo)
-13 = 5*(1/4)*m-(2*m) // - 5*(1/4)*m-(2*m)
2*m-(5*(1/4)*m)-13 = 0
(-5/4)*m+2*m-13 = 0
3/4*m-13 = 0 // + 13
3/4*m = 13 // : 3/4
m = 13/3/4
m = 52/3
m = 52/3
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