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x in (-oo:+oo)
(6/7)*x = x-4 // - x-4
(6/7)*x-x+4 = 0
4-1/7*x = 0 // - 4
-1/7*x = -4 // : -1/7
x = -4/(-1/7)
x = 28
x = 28
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