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