Answer
$-x+3y = -6$
Work Step by Step
$y+4 = 1/3*(x+6)$
$3*(y+4) =3* 1/3*(x+6)$
$3y+12 = x+6$
$3y+12-12-x = x+6-12-x$
$-x+3y = -6$
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