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y in (-oo:+oo)
-12 = (2/3)*y+6 // - (2/3)*y+6
-((2/3)*y)-12-6 = 0
(-2/3)*y-12-6 = 0
-2/3*y-18 = 0 // + 18
-2/3*y = 18 // : -2/3
y = 18/(-2/3)
y = -27
y = -27
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