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x+3=0 , x= -3
x²+8x-15=0
a=1 b=8 c=15
x={-b+-√b²-4ac}/2a
x1={-8+√8²-4(1)(-15)}/2(1) =-9,5
x2={-8-√8²-4(1)(-15)}/2(1) =1,5
............Kd