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x in (-oo:+oo)
-x-2 = (-2/7)*x+1/7 // - (-2/7)*x+1/7
-x-((-2/7)*x)-(1/7)-2 = 0
(2/7)*x-x-1/7-2 = 0
-5/7*x-15/7 = 0 // + 15/7
-5/7*x = 15/7 // : -5/7
x = 15/7/(-5/7)
x = -3
x = -3
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