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m in (-oo:+oo)
5*m+4 = 112-4*m // - 112-4*m
5*m-(-4*m)-112+4 = 0
5*m+4*m-112+4 = 0
9*m-108 = 0 // + 108
9*m = 108 // : 9
m = 108/9
m = 12
m = 12
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