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x in (-oo:+oo)
9-(4*x) = (1*x)/2+3 // - (1*x)/2+3
9-(4*x)-((1*x)/2)-3 = 0
9-4*x-(x/2)-3 = 0
6-9/2*x = 0 // - 6
-9/2*x = -6 // : -9/2
x = -6/(-9/2)
x = 4/3
x = 4/3
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