Solve for a
a=0.5
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a=\frac{0.9}{1.8}
Divide both sides by 1.8.
a=\frac{9}{18}
Expand \frac{0.9}{1.8} by multiplying both numerator and the denominator by 10.
a=\frac{1}{2}
Reduce the fraction \frac{9}{18} to lowest terms by extracting and canceling out 9.
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