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x in (-oo:+oo)
-4 = 3*x-(20/2) // - 3*x-(20/2)
20/2-(3*x)-4 = 0
20/2-3*x-4 = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x = 2
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