x^2-2x^2=12345678

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Solution for x^2-2x^2=12345678 equation: 



x^2-2x^2=12345678

We move all terms to the left:

x^2-2x^2-(12345678)=0

We add all the numbers together, and all the variables

-1x^2-12345678=0

a = -1; b = 0; c = -12345678;
Δ = b2-4ac
Δ = 02-4·(-1)·(-12345678)
Δ = -49382712
Delta is less than zero, so there is no solution for the equation

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