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y in (-oo:+oo)
(7/5)*y-6 = (-2/3)*y-(2/3) // - (-2/3)*y-(2/3)
(7/5)*y-((-2/3)*y)+2/3-6 = 0
(7/5)*y+(2/3)*y+2/3-6 = 0
31/15*y-16/3 = 0 // + 16/3
31/15*y = 16/3 // : 31/15
y = 16/3/31/15
y = 80/31
y = 80/31
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