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y in (-oo:+oo)
8 = (-4/7)*y // - (-4/7)*y
8-((-4/7)*y) = 0
(4/7)*y+8 = 0
4/7*y+8 = 0 // - 8
4/7*y = -8 // : 4/7
y = -8/4/7
y = -14
y = -14
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