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5\times 0.04=2a
Multiply both sides of the equation by 10, the least common multiple of 2,5.
0.2=2a
Multiply 5 and 0.04 to get 0.2.
2a=0.2
Swap sides so that all variable terms are on the left hand side.
a=\frac{0.2}{2}
Divide both sides by 2.
a=\frac{2}{20}
Expand \frac{0.2}{2} by multiplying both numerator and the denominator by 10.
a=\frac{1}{10}
Reduce the fraction \frac{2}{20} to lowest terms by extracting and canceling out 2.