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(3*x)/20+(2*x)/4 = 8 // - 8
(3*x)/20+(2*x)/4-8 = 0
13/20*x-8 = 0 // + 8
13/20*x = 8 // : 13/20
x = 8/13/20
x = 160/13
x = 160/13
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