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x in (-oo:+oo)
x/6 = 21/42 // - 21/42
x/6-(21/42) = 0
x/6-1/2 = 0
1/6*x-1/2 = 0 // + 1/2
1/6*x = 1/2 // : 1/6
x = 1/2/1/6
x = 3
x = 3
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