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x in (-oo:+oo)
x/2 = 40/5 // - 40/5
x/2-(40/5) = 0
x/2-8 = 0
1/2*x-8 = 0 // + 8
1/2*x = 8 // : 1/2
x = 8/1/2
x = 16
x = 16
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