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y in (-oo:+oo)
-7/2 = -((4/7)*y) // + (4/7)*y
(4/7)*y-7/2 = 0
4/7*y-7/2 = 0 // + 7/2
4/7*y = 7/2 // : 4/7
y = 7/2/4/7
y = 49/8
y = 49/8
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