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x in (-oo:+oo)
16/2 = 2*x-3*2*x // - 2*x-3*2*x
16/2-(2*x)-(-3*2*x) = 0
6*x-2*x+16/2 = 0
4*x+8 = 0 // - 8
4*x = -8 // : 4
x = -8/4
x = -2
x = -2
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