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9a^2-10a=-9
We move all terms to the left:
9a^2-10a-(-9)=0
We add all the numbers together, and all the variables
9a^2-10a+9=0
a = 9; b = -10; c = +9;
Δ = b2-4ac
Δ = -102-4·9·9
Δ = -224
Delta is less than zero, so there is no solution for the equation
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