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y in (-oo:+oo)
(2/3)*y+(4/3)*y+2 = 18 // - 18
(2/3)*y+(4/3)*y-18+2 = 0
2*y-16 = 0 // + 16
2*y = 16 // : 2
y = 16/2
y = 8
y = 8
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