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x in (-oo:+oo)
y = -3*x-(5/2)-9 // + -3*x-(5/2)-9
y-(-3*x)+5/2+9 = 0
3*x+y+5/2+9 = 0
3*x+y+23/2 = 0 // - y+23/2
3*x = -(y+23/2) // : 3
x = (-(y+23/2))/3
x = (-(y+23/2))/3
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