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x in (-oo:+oo)
x/2-3 = 1/7 // - 1/7
x/2-(1/7)-3 = 0
x/2-1/7-3 = 0
1/2*x-22/7 = 0 // + 22/7
1/2*x = 22/7 // : 1/2
x = 22/7/1/2
x = 44/7
x = 44/7
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