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x^2-8=2x^2
We move all terms to the left:
x^2-8-(2x^2)=0
We add all the numbers together, and all the variables
-1x^2-8=0
a = -1; b = 0; c = -8;
Δ = b2-4ac
Δ = 02-4·(-1)·(-8)
Δ = -32
Delta is less than zero, so there is no solution for the equation
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