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y in (-oo:+oo)
9 = (-7/3)*y // - (-7/3)*y
9-((-7/3)*y) = 0
(7/3)*y+9 = 0
7/3*y+9 = 0 // - 9
7/3*y = -9 // : 7/3
y = -9/7/3
y = -27/7
y = -27/7
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