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x in (-oo:+oo)
5/2-x-1 = 2-4/7 // - 2-4/7
5/2-x-(-4/7)-2-1 = 0
5/2-x+4/7-2-1 = 0
1/14-x = 0 // - 1/14
-x = -1/14 // * -1
x = 1/14
x = 1/14
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