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y in (-oo:+oo)
(2/3)*y+13 = (-1/2)*y+8 // - (-1/2)*y+8
(2/3)*y-((-1/2)*y)-8+13 = 0
(2/3)*y+(1/2)*y-8+13 = 0
7/6*y+5 = 0 // - 5
7/6*y = -5 // : 7/6
y = -5/7/6
y = -30/7
y = -30/7
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