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x in (-oo:+oo)
(1/3)*x-(3*y) = -4 // + 4
(1/3)*x-(3*y)+4 = 0
(1/3)*x-3*y+4 = 0
1/3*x-3*y+4 = 0 // - 4-3*y
1/3*x = -(4-3*y) // : 1/3
x = (-(4-3*y))/1/3
x = -3*(4-3*y)
x = -3*(4-3*y)
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