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x in (-oo:+oo)
-66 = -4*x-x-6 // + -4*x-x-6
x-(-4*x)-66+6 = 0
4*x+x-66+6 = 0
5*x-60 = 0 // + 60
5*x = 60 // : 5
x = 60/5
x = 12
x = 12
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