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(3*x^1)/5 = 12 // - 12
(3*x^1)/5-12 = 0
(3*x)/5-12 = 0
3/5*x-12 = 0 // + 12
3/5*x = 12 // : 3/5
x = 12/3/5
x = 20
x = 20
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