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m in (-oo:+oo)
(2/5)*(10*m+5) = 22 // - 22
(2/5)*(10*m+5)-22 = 0
2/5*(10*m+5)-22 = 0
2/5*(10*m+5)-22 = 0
4*m-20 = 0
4*m-20 = 0
4*m-20 = 0 // + 20
4*m = 20 // : 4
m = 20/4
m = 5
m = 5
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