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x in (-oo:+oo)
(4*(x+2))/4 = 2*x-8 // - 2*x-8
(4*(x+2))/4-(2*x)+8 = 0
(4*(x+2))/4-2*x+8 = 0
x-2*x+2+8 = 0
x-2*x+2+8 = 0
2-x+8 = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x = 10
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