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