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y in (-oo:+oo)
9/8 = (5/4)*y // - (5/4)*y
9/8-((5/4)*y) = 0
(-5/4)*y+9/8 = 0
9/8-5/4*y = 0 // - 9/8
-5/4*y = -9/8 // : -5/4
y = -9/8/(-5/4)
y = 9/10
y = 9/10
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