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7x-4x^2=15
We move all terms to the left:
7x-4x^2-(15)=0
a = -4; b = 7; c = -15;
Δ = b2-4ac
Δ = 72-4·(-4)·(-15)
Δ = -191
Delta is less than zero, so there is no solution for the equation
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