Solve for a
a=\frac{3}{5}=0.6
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180=300a
Multiply 15 and 20 to get 300.
300a=180
Swap sides so that all variable terms are on the left hand side.
a=\frac{180}{300}
Divide both sides by 300.
a=\frac{3}{5}
Reduce the fraction \frac{180}{300} to lowest terms by extracting and canceling out 60.
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