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x in (-oo:+oo)
x-((9/4)*x) = -5/4 // + -5/4
x-((9/4)*x)-(-5/4) = 0
x+(-9/4)*x+5/4 = 0
5/4-5/4*x = 0 // - 5/4
-5/4*x = -5/4 // : -5/4
x = -5/4/(-5/4)
x = 1
x = 1
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