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x in (-oo:+oo)
y = 18-((3*x)/6) // - 18-((3*x)/6)
(3*x)/6+y-18 = 0
1/2*x+y-18 = 0 // - y-18
1/2*x = -(y-18) // : 1/2
x = (-(y-18))/1/2
x = 2*(18-y)
x = 2*(18-y)
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