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9*x-(3/5) = 12 // - 12
9*x-(3/5)-12 = 0
9*x-3/5-12 = 0
9*x-63/5 = 0 // + 63/5
9*x = 63/5 // : 9
x = 63/5/9
x = 7/5
x = 7/5
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