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20*x-4 = 8/3 // - 8/3
20*x-(8/3)-4 = 0
20*x-8/3-4 = 0
20*x-20/3 = 0 // + 20/3
20*x = 20/3 // : 20
x = 20/3/20
x = 1/3
x = 1/3
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