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y in (-oo:+oo)
(2/3)*y+y-4 = 31 // - 31
(2/3)*y+y-31-4 = 0
5/3*y-35 = 0 // + 35
5/3*y = 35 // : 5/3
y = 35/5/3
y = 21
y = 21
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