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12x^2-9x=-12
We move all terms to the left:
12x^2-9x-(-12)=0
We add all the numbers together, and all the variables
12x^2-9x+12=0
a = 12; b = -9; c = +12;
Δ = b2-4ac
Δ = -92-4·12·12
Δ = -495
Delta is less than zero, so there is no solution for the equation
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