18=15-5xL2

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Solution for 18=15-5xL2 equation: 



18=15-5x^2

We move all terms to the left:

18-(15-5x^2)=0

We get rid of parentheses

5x^2-15+18=0

We add all the numbers together, and all the variables

5x^2+3=0

a = 5; b = 0; c = +3;
Δ = b2-4ac
Δ = 02-4·5·3
Δ = -60
Delta is less than zero, so there is no solution for the equation

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