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x in (-oo:+oo)
(1/2)*x-((3/2)*x) = 9/4 // - 9/4
(1/2)*x-((3/2)*x)-(9/4) = 0
(1/2)*x+(-3/2)*x-9/4 = 0
-x-9/4 = 0 // + 9/4
-x = 9/4 // * -1
x = -9/4
x = -9/4
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