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5*x-9/10 = 491/10 // - 491/10
5*x-9/10-(491/10) = 0
5*x-9/10-491/10 = 0
5*x-50 = 0 // + 50
5*x = 50 // : 5
x = 50/5
x = 10
x = 10
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