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2x(7-x)=65
We move all terms to the left:
2x(7-x)-(65)=0
We add all the numbers together, and all the variables
2x(-1x+7)-65=0
We multiply parentheses
-2x^2+14x-65=0
a = -2; b = 14; c = -65;
Δ = b2-4ac
Δ = 142-4·(-2)·(-65)
Δ = -324
Delta is less than zero, so there is no solution for the equation
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