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x in (-oo:+oo)
3*x-(4/2) = 4*x+20 // - 4*x+20
3*x-(4*x)-(4/2)-20 = 0
3*x-4*x-20-2 = 0
-x-22 = 0 // + 22
-x = 22 // * -1
x = -22
x = -22
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