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