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y in (-oo:+oo)
20 = (-4/3)*y // - (-4/3)*y
20-((-4/3)*y) = 0
(4/3)*y+20 = 0
4/3*y+20 = 0 // - 20
4/3*y = -20 // : 4/3
y = -20/4/3
y = -15
y = -15
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