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