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m in (-oo:+oo)
15/4 = 7*m-4*m+3/4 // - 7*m-4*m+3/4
15/4-(-4*m)-(7*m)-(3/4) = 0
4*m-7*m+15/4-3/4 = 0
3-3*m = 0 // - 3
-3*m = -3 // : -3
m = -3/(-3)
m = 1
m = 1
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