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m in (-oo:+oo)
(2*m-1)/19 = m/10 // - m/10
(2*m-1)/19-(m/10) = 0
(2*m-1)/19-m/10 = 0
(10*(2*m-1))/(10*19)+(19*(-m))/(10*19) = 0
10*(2*m-1)+19*(-m) = 0
m-10 = 0
(m-10)/(10*19) = 0
(m-10)/(10*19) = 0 // * 10*19
m-10 = 0
m-10 = 0 // + 10
m = 10
m = 10
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