2 d = b − c a − b b − c a − b = 2 d ∣ m u lt i pl y b o t h s i d es b y ( b − c ) a − b = 2 d ( b − c ) ∣ a dd " b " t o b o t h s i d es a = 2 b d − 2 c d + b
To solve for a in the equation 2 d = b − c a − b , multiply both sides by ( b − c ) to eliminate the fraction, then isolate a to obtain the formula a = 2 d b − 2 d c + b .
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