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303=15x-2x^2
We move all terms to the left:
303-(15x-2x^2)=0
We get rid of parentheses
2x^2-15x+303=0
a = 2; b = -15; c = +303;
Δ = b2-4ac
Δ = -152-4·2·303
Δ = -2199
Delta is less than zero, so there is no solution for the equation
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