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m in (-oo:+oo)
(3/10)*m-12 = 4 // - 4
(3/10)*m-12-4 = 0
3/10*m-16 = 0 // + 16
3/10*m = 16 // : 3/10
m = 16/3/10
m = 160/3
m = 160/3
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