Solve for A
A=37.5
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30=0.8A
Combine A and -A\times 0.2 to get 0.8A.
0.8A=30
Swap sides so that all variable terms are on the left hand side.
A=\frac{30}{0.8}
Divide both sides by 0.8.
A=\frac{300}{8}
Expand \frac{30}{0.8} by multiplying both numerator and the denominator by 10.
A=\frac{75}{2}
Reduce the fraction \frac{300}{8} to lowest terms by extracting and canceling out 4.
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