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10x-x^2=64
We move all terms to the left:
10x-x^2-(64)=0
We add all the numbers together, and all the variables
-1x^2+10x-64=0
a = -1; b = 10; c = -64;
Δ = b2-4ac
Δ = 102-4·(-1)·(-64)
Δ = -156
Delta is less than zero, so there is no solution for the equation
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