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3x-x2=40
We move all terms to the left:
3x-x2-(40)=0
We add all the numbers together, and all the variables
-1x^2+3x-40=0
a = -1; b = 3; c = -40;
Δ = b2-4ac
Δ = 32-4·(-1)·(-40)
Δ = -151
Delta is less than zero, so there is no solution for the equation
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