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x in (-oo:+oo)
67 = 7*x-x+7 // - 7*x-x+7
x-(7*x)-7+67 = 0
x-7*x-7+67 = 0
60-6*x = 0 // - 60
-6*x = -60 // : -6
x = -60/(-6)
x = 10
x = 10
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