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x in (-oo:+oo)
(2/7)*x-8 = 2*x-(68/7) // - 2*x-(68/7)
(2/7)*x-(2*x)+68/7-8 = 0
(2/7)*x-2*x+68/7-8 = 0
12/7-12/7*x = 0 // - 12/7
-12/7*x = -12/7 // : -12/7
x = -12/7/(-12/7)
x = 1
x = 1
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