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m in (-oo:+oo)
0.9 = m/2.5 // - m/2.5
0.9-(m/2.5) = 0
0.9-0.4*m = 0
0.9-0.4*m = 0 // - 0.9
-0.4*m = -0.9 // : -0.4
m = -0.9/(-0.4)
m = 2.25
m = 2.25
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