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-12x^2+25x=84
We move all terms to the left:
-12x^2+25x-(84)=0
a = -12; b = 25; c = -84;
Δ = b2-4ac
Δ = 252-4·(-12)·(-84)
Δ = -3407
Delta is less than zero, so there is no solution for the equation
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