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x in (-oo:+oo)
(3/2)*x-(2*x) = -5-4 // + -5-4
(3/2)*x-(2*x)+4+5 = 0
(3/2)*x-2*x+4+5 = 0
9-1/2*x = 0 // - 9
-1/2*x = -9 // : -1/2
x = -9/(-1/2)
x = 18
x = 18
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