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