x^2+bx+20=0
(-5)^2 - 5b+20=0
25-5b+20=0
-5b+45=0
-5b=-45
b=9
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x^2+bx+20=0
(-5)^2 - 5b+20=0
25-5b+20=0
-5b+45=0
-5b=-45
b=9