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x in (-oo:+oo)
7*x-(5/2) = 23 // - 23
7*x-(5/2)-23 = 0
7*x-5/2-23 = 0
7*x-51/2 = 0 // + 51/2
7*x = 51/2 // : 7
x = 51/2/7
x = 51/14
x = 51/14
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