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y in (-oo:+oo)
(4/9)*y-12 = (1/4)*y-4 // - (1/4)*y-4
(4/9)*y-((1/4)*y)-12+4 = 0
(4/9)*y+(-1/4)*y-12+4 = 0
7/36*y-8 = 0 // + 8
7/36*y = 8 // : 7/36
y = 8/7/36
y = 288/7
y = 288/7
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