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x in (-oo:+oo)
6/7-(4*x) = -162/7 // + -162/7
6/7-(4*x)-(-162/7) = 0
6/7-4*x+162/7 = 0
24-4*x = 0 // - 24
-4*x = -24 // : -4
x = -24/(-4)
x = 6
x = 6
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