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x in (-oo:+oo)
(-9/2)*x-2 = (1/2)*x // - (1/2)*x
(-9/2)*x-((1/2)*x)-2 = 0
(-9/2)*x+(-1/2)*x-2 = 0
-5*x-2 = 0 // + 2
-5*x = 2 // : -5
x = 2/(-5)
x = -2/5
x = -2/5
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