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-3x(x-5)=45
We move all terms to the left:
-3x(x-5)-(45)=0
We multiply parentheses
-3x^2+15x-45=0
a = -3; b = 15; c = -45;
Δ = b2-4ac
Δ = 152-4·(-3)·(-45)
Δ = -315
Delta is less than zero, so there is no solution for the equation
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