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x in (-oo:+oo)
2/7-(4*x) = -26/7 // + -26/7
2/7-(4*x)-(-26/7) = 0
2/7-4*x+26/7 = 0
4-4*x = 0 // - 4
-4*x = -4 // : -4
x = -4/(-4)
x = 1
x = 1
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