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x in (-oo:+oo)
4-(3*x)-x = -16 // + 16
4-(3*x)-x+16 = 0
4-3*x-x+16 = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x = 5
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