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x in (-oo:+oo)
x/2 = 80/1 // - 80/1
x/2-(80/1) = 0
x/2-80 = 0
1/2*x-80 = 0 // + 80
1/2*x = 80 // : 1/2
x = 80/1/2
x = 160
x = 160
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