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(4*x-16)/3-4 = 0
(4*x-16)/3+(-4*3)/3 = 0
4*x-4*3-16 = 0
4*x-28 = 0
(4*x-28)/3 = 0
(4*x-28)/3 = 0 // * 3
4*x-28 = 0
4*x-28 = 0 // + 28
4*x = 28 // : 4
x = 28/4
x = 7
x = 7
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