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m in (-oo:+oo)
5*(4*m-9) = -5 // + 5
5*(4*m-9)+5 = 0
5*(4*m-9)+5 = 0
20*m-40 = 0
20*m-40 = 0
20*m-40 = 0 // + 40
20*m = 40 // : 20
m = 40/20
m = 2
m = 2
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