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m in (-oo:+oo)
4-7*m = -3*m-4 // + -3*m-4
4-7*m-(-3*m)+4 = 0
3*m-7*m+4+4 = 0
8-4*m = 0 // - 8
-4*m = -8 // : -4
m = -8/(-4)
m = 2
m = 2
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