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p2-10p+24=0
p2-6p-4p+24=0
p(p-6)+4(p-6)=0
p=6 or p=4
a2-9a-90=0
a2-15a+6a-90=0
a(a-15)+6(a-15)=0
a=15 or a=6
x2-x-42=0
x2-7x+6x-42=0
x(x-7)+6(x-7)=0
(x-7)(x+6)=0
x=7 or x=-6
x2-5x+6=0
x2-3x-2x+6=0
x(x-3)-2(x-3)=0
x=3 or x=2
x2-10x+16=0
x2-8x-2x+16=0
x(x-8)-2(x-8)=0
x=8 or x=2
a2+20a-69=0
a2+23a-3a-69=0
a(a+23)-3(a+23)=0
a=-23 or a=3
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