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