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x in (-oo:+oo)
x/8 = 16/4 // - 16/4
x/8-(16/4) = 0
x/8-4 = 0
1/8*x-4 = 0 // + 4
1/8*x = 4 // : 1/8
x = 4/1/8
x = 32
x = 32
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