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y in (-oo:+oo)
-4 = (-2/3)*y // - (-2/3)*y
-((-2/3)*y)-4 = 0
(2/3)*y-4 = 0
2/3*y-4 = 0 // + 4
2/3*y = 4 // : 2/3
y = 4/2/3
y = 6
y = 6
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