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x in (-oo:+oo)
7*x-(1/3) = 5 // - 5
7*x-(1/3)-5 = 0
7*x-1/3-5 = 0
7*x-16/3 = 0 // + 16/3
7*x = 16/3 // : 7
x = 16/3/7
x = 16/21
x = 16/21
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