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y in (-oo:+oo)
-4/5 = (-1/2)*y-(4/7) // - (-1/2)*y-(4/7)
4/7-((-1/2)*y)-4/5 = 0
(1/2)*y-4/5+4/7 = 0
1/2*y-8/35 = 0 // + 8/35
1/2*y = 8/35 // : 1/2
y = 8/35/1/2
y = 16/35
y = 16/35
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