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y in (-oo:+oo)
(1/4)*y-8 = (1/9)*y // - (1/9)*y
(1/4)*y-((1/9)*y)-8 = 0
(1/4)*y+(-1/9)*y-8 = 0
5/36*y-8 = 0 // + 8
5/36*y = 8 // : 5/36
y = 8/5/36
y = 288/5
y = 288/5
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