12 - 5x - 4kx = y.....subtract 12 from each side-5x - 4kx = y - 12....factor out x on the leftx(-5 - 4k) = y - 12 ...divide both sides by -5 - 4kx = (y - 12) / (-5 - 4k) or x = (-y + 12) / (4k + 5) <==...

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