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y in (-oo:+oo)
(2/3)*y+y-4 = -30 // + 30
(2/3)*y+y-4+30 = 0
5/3*y+26 = 0 // - 26
5/3*y = -26 // : 5/3
y = -26/5/3
y = -78/5
y = -78/5
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