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Algebra Difficulty 3.8 AMC 10/12 Find the answer Slovenia
For non-zero real numbers a, b and c we have
a=b+2c,a+c=b+d,b=d+c.
Which of the following equalities is certainly true?
Pick one
Solution
Since b=a−2c and d=b−c=a−3c, we have a+c=a−2c+a−3c and a=6c.
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