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x in (-oo:+oo)
x/7-3 = 13/14 // - 13/14
x/7-(13/14)-3 = 0
x/7-13/14-3 = 0
1/7*x-55/14 = 0 // + 55/14
1/7*x = 55/14 // : 1/7
x = 55/14/1/7
x = 55/2
x = 55/2
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