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y in (-oo:+oo)
(3/7)*y+13 = (-1/2)*y+8 // - (-1/2)*y+8
(3/7)*y-((-1/2)*y)-8+13 = 0
(3/7)*y+(1/2)*y-8+13 = 0
13/14*y+5 = 0 // - 5
13/14*y = -5 // : 13/14
y = -5/13/14
y = -70/13
y = -70/13
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