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m in (-oo:+oo)
(3/5)*(m-10) = 12 // - 12
(3/5)*(m-10)-12 = 0
3/5*(m-10)-12 = 0
3/5*(m-10)-12 = 0
3/5*m-18 = 0
3/5*m-18 = 0
3/5*m-18 = 0 // + 18
3/5*m = 18 // : 3/5
m = 18/3/5
m = 30
m = 30
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