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y in (-oo:+oo)
12 = 6-((2/3)*y) // - 6-((2/3)*y)
(2/3)*y-6+12 = 0
2/3*y+6 = 0 // - 6
2/3*y = -6 // : 2/3
y = -6/2/3
y = -9
y = -9
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