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x in (-oo:+oo)
8*x-(65/81) = y // - y
8*x-y-(65/81) = 0
8*x-y-65/81 = 0
8*x-y-65/81 = 0 // + -y-65/81
8*x = -(-y-65/81) // : 8
x = (-(-y-65/81))/8
x = (y+65/81)/8
x = (y+65/81)/8
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