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