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x in (-oo:+oo)
(4/5)*x-((9/4)*x)-3-1 = 0
(4/5)*x+(-9/4)*x-3-1 = 0
-29/20*x-4 = 0 // + 4
-29/20*x = 4 // : -29/20
x = 4/(-29/20)
x = -80/29
x = -80/29
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