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