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x in (-oo:+oo)
2*x-(7/6) = 21 // - 21
2*x-(7/6)-21 = 0
2*x-7/6-21 = 0
2*x-133/6 = 0 // + 133/6
2*x = 133/6 // : 2
x = 133/6/2
x = 133/12
x = 133/12
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