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y in (-oo:+oo)
(1/4)*y-9 = (1/9)*y // - (1/9)*y
(1/4)*y-((1/9)*y)-9 = 0
(1/4)*y+(-1/9)*y-9 = 0
5/36*y-9 = 0 // + 9
5/36*y = 9 // : 5/36
y = 9/5/36
y = 324/5
y = 324/5
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