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y in (-oo:+oo)
2/5 = (5/12)*y // - (5/12)*y
2/5-((5/12)*y) = 0
(-5/12)*y+2/5 = 0
2/5-5/12*y = 0 // - 2/5
-5/12*y = -2/5 // : -5/12
y = -2/5/(-5/12)
y = 24/25
y = 24/25
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