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x in (-oo:+oo)
2*x-(2/4) = 6 // - 6
2*x-(2/4)-6 = 0
2*x-1/2-6 = 0
2*x-13/2 = 0 // + 13/2
2*x = 13/2 // : 2
x = 13/2/2
x = 13/4
x = 13/4
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