So from the form (A+B)/C=(D-A)/E, you'll want to separate each side into two fractions making them A/C +B/C = D/E-A/E.

Then move move the A/E to the side with the A/C and the B/C to the side with D/E giving you A/C +A/E = D/E - B/C

Then factor out A from the left side of the equation: A (1/C +1/E) = D/E - B/C

and divide (1/C + 1/E) from both sides thus isolating A giving you

A= (D/E - B/C) / (1/C + 1/E)

Good luck!
Let me know if you have any questions!
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