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## Homework Statement

If ADD = 9

BAD = 7

CAD = 8

Find ADA .

## Homework Equations

Algebra

## The Attempt at a Solution

ADDBAD=9*7

BADCAD=56

ADABCC= 56*8/9

B/C = 7/8

I really don't know how to approach this problem, what must I eliminate and how should I do it ?