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y in (-oo:+oo)
25 = (5/4)*y // - (5/4)*y
25-((5/4)*y) = 0
(-5/4)*y+25 = 0
25-5/4*y = 0 // - 25
-5/4*y = -25 // : -5/4
y = -25/(-5/4)
y = 20
y = 20
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