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