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(9/10)*x-(1/5) = 6 // - 6
(9/10)*x-(1/5)-6 = 0
(9/10)*x-1/5-6 = 0
9/10*x-31/5 = 0 // + 31/5
9/10*x = 31/5 // : 9/10
x = 31/5/9/10
x = 62/9
x = 62/9
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