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(2*x-9)/5 = 1 // - 1
(2*x-9)/5-1 = 0
(2*x-9)/5+(-1*5)/5 = 0
2*x-1*5-9 = 0
2*x-14 = 0
(2*x-14)/5 = 0
(2*x-14)/5 = 0 // * 5
2*x-14 = 0
2*x-14 = 0 // + 14
2*x = 14 // : 2
x = 14/2
x = 7
x = 7
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