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x in (-oo:+oo)
5/7-(2*x) = -37/7 // + -37/7
5/7-(2*x)-(-37/7) = 0
5/7-2*x+37/7 = 0
6-2*x = 0 // - 6
-2*x = -6 // : -2
x = -6/(-2)
x = 3
x = 3
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