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m in (-oo:+oo)
m/5+4 = 6.25 // - 6.25
m/5-6.25+4 = 0
1/5*m-2.25 = 0 // + 2.25
1/5*m = 2.25 // : 1/5
m = 2.25/1/5
m = 11.25
m = 11.25
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