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m in (-oo:+oo)
1-2*m = 15-4*m // - 15-4*m
1-2*m-(-4*m)-15 = 0
4*m-2*m-15+1 = 0
2*m-14 = 0 // + 14
2*m = 14 // : 2
m = 14/2
m = 7
m = 7
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