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7*x-20 = -17/2 // + -17/2
7*x-(-17/2)-20 = 0
7*x+17/2-20 = 0
7*x-23/2 = 0 // + 23/2
7*x = 23/2 // : 7
x = 23/2/7
x = 23/14
x = 23/14
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