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x in (-oo:+oo)
x-9 = (-3/2)*x // - (-3/2)*x
x-((-3/2)*x)-9 = 0
x+(3/2)*x-9 = 0
5/2*x-9 = 0 // + 9
5/2*x = 9 // : 5/2
x = 9/5/2
x = 18/5
x = 18/5
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