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x2-4(x-2)=0
We add all the numbers together, and all the variables
x^2-4(x-2)=0
We multiply parentheses
x^2-4x+8=0
a = 1; b = -4; c = +8;
Δ = b2-4ac
Δ = -42-4·1·8
Δ = -16
Delta is less than zero, so there is no solution for the equation
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