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x in (-oo:+oo)
x/7 = 1/3 // - 1/3
x/7-(1/3) = 0
x/7-1/3 = 0
1/7*x-1/3 = 0 // + 1/3
1/7*x = 1/3 // : 1/7
x = 1/3/1/7
x = 7/3
x = 7/3
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