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5d^2+10d+8=2d^
We move all terms to the left:
5d^2+10d+8-(2d^)=0
We add all the numbers together, and all the variables
5d^2+8d+8=0
a = 5; b = 8; c = +8;
Δ = b2-4ac
Δ = 82-4·5·8
Δ = -96
Delta is less than zero, so there is no solution for the equation
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