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m in (-oo:+oo)
(4/5)*m+8 = 42/5 // - 42/5
(4/5)*m-(42/5)+8 = 0
(4/5)*m-42/5+8 = 0
4/5*m-2/5 = 0 // + 2/5
4/5*m = 2/5 // : 4/5
m = 2/5/4/5
m = 1/2
m = 1/2
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