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x in (-oo:+oo)
5/7 = x/2 // - x/2
5/7-(x/2) = 0
5/7-1/2*x = 0 // - 5/7
-1/2*x = -5/7 // : -1/2
x = -5/7/(-1/2)
x = 10/7
x = 10/7
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