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150x-x^2=12000
We move all terms to the left:
150x-x^2-(12000)=0
We add all the numbers together, and all the variables
-1x^2+150x-12000=0
a = -1; b = 150; c = -12000;
Δ = b2-4ac
Δ = 1502-4·(-1)·(-12000)
Δ = -25500
Delta is less than zero, so there is no solution for the equation
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