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y in (-oo:+oo)
18 = y/2.5-2 // - y/2.5-2
2-(y/2.5)+18 = 0
2-0.4*y+18 = 0
20-0.4*y = 0 // - 20
-0.4*y = -20 // : -0.4
y = -20/(-0.4)
y = 50
y = 50
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