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x in (-oo:+oo)
6*x = 42/11 // - 42/11
6*x-(42/11) = 0
6*x-42/11 = 0
6*x-42/11 = 0 // + 42/11
6*x = 42/11 // : 6
x = 42/11/6
x = 7/11
x = 7/11
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