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(1/6)*(x-20) = 20 // - 20
(1/6)*(x-20)-20 = 0
1/6*(x-20)-20 = 0
1/6*(x-20)-20 = 0
1/6*x-70/3 = 0
1/6*x-70/3 = 0
1/6*x-70/3 = 0 // + 70/3
1/6*x = 70/3 // : 1/6
x = 70/3/1/6
x = 140
x = 140
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