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x in (-oo:+oo)
x/4 = 8/2 // - 8/2
x/4-(8/2) = 0
x/4-4 = 0
1/4*x-4 = 0 // + 4
1/4*x = 4 // : 1/4
x = 4/1/4
x = 16
x = 16
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