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x in (-oo:+oo)
2*x-(1/4) = 84 // - 84
2*x-(1/4)-84 = 0
2*x-1/4-84 = 0
2*x-337/4 = 0 // + 337/4
2*x = 337/4 // : 2
x = 337/4/2
x = 337/8
x = 337/8
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