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x in (-oo:+oo)
x/3-(3*y) = 6 // - 6
x/3-(3*y)-6 = 0
x/3-3*y-6 = 0
1/3*x-3*y-6 = 0 // + -3*y-6
1/3*x = -(-3*y-6) // : 1/3
x = (-(-3*y-6))/1/3
x = 3*(6-(-3*y))
x = 3*(6-(-3*y))
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