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x in (-oo:+oo)
x/3-(1/7) = 11/21 // - 11/21
x/3-(1/7)-(11/21) = 0
x/3-1/7-11/21 = 0
1/3*x-2/3 = 0 // + 2/3
1/3*x = 2/3 // : 1/3
x = 2/3/1/3
x = 2
x = 2
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