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y in (-oo:+oo)
(1/3)*(y+27)-4 = 0
1/3*(y+27)-4 = 0
1/3*(y+27)-4 = 0
1/3*y+5 = 0
1/3*y+5 = 0
1/3*y+5 = 0 // - 5
1/3*y = -5 // : 1/3
y = -5/1/3
y = -15
y = -15
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