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x²-4x+4-x²=x²+3x+x+3+17
x²-4x+4-x²-x²-3x-x-3-17=0
-x²-8x-16=0
Δ=b²-4ac
Δ=(-8)²-4*(-1)*(-16) = 64-64=0
xo=-b / 2a = 8 / -2 = -4