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x in (-oo:+oo)
6*x = 21/5 // - 21/5
6*x-(21/5) = 0
6*x-21/5 = 0
6*x-21/5 = 0 // + 21/5
6*x = 21/5 // : 6
x = 21/5/6
x = 7/10
x = 7/10
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