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1*((20*(x-5))/50) = 6 // - 6
1*((20*(x-5))/50)-6 = 0
(20*(x-5))/50-6 = 0
(20*(x-5))/50+(-6*50)/50 = 0
20*(x-5)-6*50 = 0
20*x-400 = 0
(20*x-400)/50 = 0
(20*x-400)/50 = 0 // * 50
20*x-400 = 0
20*x-400 = 0 // + 400
20*x = 400 // : 20
x = 400/20
x = 20
x = 20
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