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m in (-oo:+oo)
(3/5)*m-((1/4)*m)-3 = -5/4 // + -5/4
(3/5)*m-((1/4)*m)-(-5/4)-3 = 0
(-1/4)*m+(3/5)*m+5/4-3 = 0
7/20*m-7/4 = 0 // + 7/4
7/20*m = 7/4 // : 7/20
m = 7/4/7/20
m = 5
m = 5
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