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y in (-oo:+oo)
(2/3)*y-((1/6)*y)+4 = 19 // - 19
(2/3)*y-((1/6)*y)-19+4 = 0
(2/3)*y+(-1/6)*y-19+4 = 0
1/2*y-15 = 0 // + 15
1/2*y = 15 // : 1/2
y = 15/1/2
y = 30
y = 30
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