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x in (-oo:+oo)
(1/3)*x-((1/2)*y) = 4 // - 4
(1/3)*x-((1/2)*y)-4 = 0
(1/3)*x+(-1/2)*y-4 = 0
1/3*x-1/2*y-4 = 0 // + -1/2*y-4
1/3*x = -(-1/2*y-4) // : 1/3
x = (-(-1/2*y-4))/1/3
x = 3*(4-(-1/2*y))
x = 3*(4-(-1/2*y))
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