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y in (-oo:+oo)
8 = (-2/7)*y // - (-2/7)*y
8-((-2/7)*y) = 0
(2/7)*y+8 = 0
2/7*y+8 = 0 // - 8
2/7*y = -8 // : 2/7
y = -8/2/7
y = -28
y = -28
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