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m in (-oo:+oo)
5*((1/5)*m+2/5) = 3/5 // - 3/5
5*((1/5)*m+2/5)-(3/5) = 0
5*((1/5)*m+2/5)-3/5 = 0
5*(1/5*m+2/5)-3/5 = 0
(5^2*(1/5*m+2/5))/5-3/5 = 0
5^2*(1/5*m+2/5)-3 = 0
5*m+7 = 0
(5*m+7)/5 = 0
(5*m+7)/5 = 0 // * 5
5*m+7 = 0
5*m+7 = 0 // - 7
5*m = -7 // : 5
m = -7/5
m = -7/5
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