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x in (-oo:+oo)
2*x-(1/4) = 7 // - 7
2*x-(1/4)-7 = 0
2*x-1/4-7 = 0
2*x-29/4 = 0 // + 29/4
2*x = 29/4 // : 2
x = 29/4/2
x = 29/8
x = 29/8
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