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17/14 = 2*x-7*x+1/2 // - 2*x-7*x+1/2
17/14-(-7*x)-(2*x)-(1/2) = 0
7*x-2*x+17/14-1/2 = 0
5*x+5/7 = 0 // - 5/7
5*x = -5/7 // : 5
x = -5/7/5
x = -1/7
x = -1/7
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