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y in (-oo:+oo)
8/3 = -2*y // + -2*y
8/3-(-2*y) = 0
2*y+8/3 = 0
2*y+8/3 = 0 // - 8/3
2*y = -8/3 // : 2
y = -8/3/2
y = -4/3
y = -4/3
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