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m in (-oo:+oo)
1-(4*m) = 19-7*m // - 19-7*m
1-(4*m)-(-7*m)-19 = 0
7*m-4*m-19+1 = 0
3*m-18 = 0 // + 18
3*m = 18 // : 3
m = 18/3
m = 6
m = 6
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