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m in (-oo:+oo)
(3/5)*m+3*m+2 = 20 // - 20
(3/5)*m+3*m-20+2 = 0
18/5*m-18 = 0 // + 18
18/5*m = 18 // : 18/5
m = 18/18/5
m = 5
m = 5
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