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x in (-oo:+oo)
Y = 18-(x/3) // - 18-(x/3)
Y+x/3-18 = 0
Y+1/3*x-18 = 0 // - Y-18
1/3*x = -(Y-18) // : 1/3
x = (-(Y-18))/1/3
x = 3*(18-Y)
x = 3*(18-Y)
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