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