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m in (-oo:+oo)
(5*m-12)/4 = 2 // - 2
(5*m-12)/4-2 = 0
(5*m-12)/4+(-2*4)/4 = 0
5*m-2*4-12 = 0
5*m-20 = 0
(5*m-20)/4 = 0
(5*m-20)/4 = 0 // * 4
5*m-20 = 0
5*m-20 = 0 // + 20
5*m = 20 // : 5
m = 20/5
m = 4
m = 4
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