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x in (-oo:+oo)
(2/7)*(-9*x-1) = -8 // + 8
(2/7)*(-9*x-1)+8 = 0
2/7*(-9*x-1)+8 = 0
2/7*(-9*x-1)+8 = 0
54/7-18/7*x = 0
54/7-18/7*x = 0
54/7-18/7*x = 0 // - 54/7
-18/7*x = -54/7 // : -18/7
x = -54/7/(-18/7)
x = 3
x = 3
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