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y in (-oo:+oo)
5 = y/4-(2*y) // - y/4-(2*y)
2*y-(y/4)+5 = 0
7/4*y+5 = 0 // - 5
7/4*y = -5 // : 7/4
y = -5/7/4
y = -20/7
y = -20/7
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