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3x^2+7x+15=7
We move all terms to the left:
3x^2+7x+15-(7)=0
We add all the numbers together, and all the variables
3x^2+7x+8=0
a = 3; b = 7; c = +8;
Δ = b2-4ac
Δ = 72-4·3·8
Δ = -47
Delta is less than zero, so there is no solution for the equation
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