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X + ( X-80) = 600 ( add X's together and add 80 to each side )
2X = 680 ( divide both sides by 2 )
X = 340 ( Look at first equation/statement )
340 - 80 = 260
check:
340 + 260 = 600
answer checks. Two numbers added together to = 600 that are 80 units apart.
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