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x in (-oo:+oo)
(-9/4)*x = (1/4)*x-(3/8) // - (1/4)*x-(3/8)
(-9/4)*x-((1/4)*x)+3/8 = 0
(-9/4)*x+(-1/4)*x+3/8 = 0
3/8-5/2*x = 0 // - 3/8
-5/2*x = -3/8 // : -5/2
x = -3/8/(-5/2)
x = 3/20
x = 3/20
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