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x in (-oo:+oo)
-7*x-(5/7) = 191/7 // - 191/7
-7*x-(5/7)-(191/7) = 0
-7*x-5/7-191/7 = 0
-7*x-28 = 0 // + 28
-7*x = 28 // : -7
x = 28/(-7)
x = -4
x = -4
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