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6x^2+15x+18=6
We move all terms to the left:
6x^2+15x+18-(6)=0
We add all the numbers together, and all the variables
6x^2+15x+12=0
a = 6; b = 15; c = +12;
Δ = b2-4ac
Δ = 152-4·6·12
Δ = -63
Delta is less than zero, so there is no solution for the equation
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