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