If O+∆=4882 And O+∆+∆=6871. SO the value of O-∆=?
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O + Δ = 4882(equation 1)
O + Δ + Δ = 6871(equation 2)
Subtracting 1 from 2
O + Δ + Δ -O-Δ = 6871-4882
Δ = 1989
Substituting Δ value in equation 1
O + 1989 = 4882
O = 4882-1989
O = 2893
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