Solve for d
d=\frac{A}{87000000}
Solve for A
A=87000000d
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87000000d=A
Swap sides so that all variable terms are on the left hand side.
\frac{87000000d}{87000000}=\frac{A}{87000000}
Divide both sides by 87000000.
d=\frac{A}{87000000}
Dividing by 87000000 undoes the multiplication by 87000000.
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