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a-b=8
a=8+b
a2+ab-ab-b2=144
a2-b2=144
(8+b)2-b2=144
(8+b)(8+b)-b2=144
64+8b+8b+b2-b2=144
16b=144-64
16b=80
b=5
a-b=8
a-5=8
a=13
a=13
b=5