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y in (-oo:+oo)
(1/3)*y-9 = (1/10)*y // - (1/10)*y
(1/3)*y-((1/10)*y)-9 = 0
(1/3)*y+(-1/10)*y-9 = 0
7/30*y-9 = 0 // + 9
7/30*y = 9 // : 7/30
y = 9/7/30
y = 270/7
y = 270/7
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