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m in (-oo:+oo)
0.2*m-(5/4) = 7/20 // - 7/20
0.2*m-(5/4)-(7/20) = 0
0.2*m-5/4-7/20 = 0
0.2*m-8/5 = 0 // + 8/5
0.2*m = 8/5 // : 0.2
m = 8/5/0.2
m = 8
m = 8
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