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y in (-oo:+oo)
18-((2/3)*y) = (5/6)*y // - (5/6)*y
18-((2/3)*y)-((5/6)*y) = 0
(-2/3)*y+(-5/6)*y+18 = 0
18-3/2*y = 0 // - 18
-3/2*y = -18 // : -3/2
y = -18/(-3/2)
y = 12
y = 12
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