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x in (-oo:+oo)
6-(5*x) = 66 // - 66
6-(5*x)-66 = 0
6-5*x-66 = 0
-5*x-60 = 0 // + 60
-5*x = 60 // : -5
x = 60/(-5)
x = -12
x = -12
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