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x in (-oo:+oo)
4/7-(3*x) = -17/7 // + -17/7
4/7-(3*x)-(-17/7) = 0
4/7-3*x+17/7 = 0
3-3*x = 0 // - 3
-3*x = -3 // : -3
x = -3/(-3)
x = 1
x = 1
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