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x in (-oo:+oo)
-1 = (-2/7)*x-7 // - (-2/7)*x-7
7-((-2/7)*x)-1 = 0
(2/7)*x-1+7 = 0
2/7*x+6 = 0 // - 6
2/7*x = -6 // : 2/7
x = -6/2/7
x = -21
x = -21
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