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x in (-oo:+oo)
7*x-(2/6) = 1 // - 1
7*x-(2/6)-1 = 0
7*x-1/3-1 = 0
7*x-4/3 = 0 // + 4/3
7*x = 4/3 // : 7
x = 4/3/7
x = 4/21
x = 4/21
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