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x in (-oo:+oo)
y = -3*x-(18/4) // + -3*x-(18/4)
y-(-3*x)+18/4 = 0
3*x+y+18/4 = 0
3*x+y+9/2 = 0 // - y+9/2
3*x = -(y+9/2) // : 3
x = (-(y+9/2))/3
x = (-(y+9/2))/3
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