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y in (-oo:+oo)
12-((2/3)*y) = 4 // - 4
12-((2/3)*y)-4 = 0
(-2/3)*y-4+12 = 0
8-2/3*y = 0 // - 8
-2/3*y = -8 // : -2/3
y = -8/(-2/3)
y = 12
y = 12
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