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x in (-oo:+oo)
5/7-(2*x) = 4 // - 4
5/7-(2*x)-4 = 0
5/7-2*x-4 = 0
-2*x-23/7 = 0 // + 23/7
-2*x = 23/7 // : -2
x = 23/7/(-2)
x = -23/14
x = -23/14
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