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6x-15x^2=123
We move all terms to the left:
6x-15x^2-(123)=0
a = -15; b = 6; c = -123;
Δ = b2-4ac
Δ = 62-4·(-15)·(-123)
Δ = -7344
Delta is less than zero, so there is no solution for the equation
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