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x in (-oo:+oo)
(-2/7)*x = 6/11 // - 6/11
(-2/7)*x-(6/11) = 0
(-2/7)*x-6/11 = 0
-2/7*x-6/11 = 0 // + 6/11
-2/7*x = 6/11 // : -2/7
x = 6/11/(-2/7)
x = -21/11
x = -21/11
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