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