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y in (-oo:+oo)
(1/2)*y-6 = (1/9)*y // - (1/9)*y
(1/2)*y-((1/9)*y)-6 = 0
(1/2)*y+(-1/9)*y-6 = 0
7/18*y-6 = 0 // + 6
7/18*y = 6 // : 7/18
y = 6/7/18
y = 108/7
y = 108/7
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