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x in (-oo:+oo)
(-3/2)*x-((3/2)*(-3/20)*x) = 9/4 // - 9/4
(-3/2)*x-((3/2)*(-3/20)*x)-(9/4) = 0
(-3/2)*x+(9/40)*x-9/4 = 0
-51/40*x-9/4 = 0 // + 9/4
-51/40*x = 9/4 // : -51/40
x = 9/4/(-51/40)
x = -30/17
x = -30/17
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