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y in (-oo:+oo)
-4/5 = (4/7)*y-(1/2) // - (4/7)*y-(1/2)
1/2-((4/7)*y)-4/5 = 0
(-4/7)*y-4/5+1/2 = 0
-4/7*y-3/10 = 0 // + 3/10
-4/7*y = 3/10 // : -4/7
y = 3/10/(-4/7)
y = -21/40
y = -21/40
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