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\frac{2}{5}=0.16x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
0.16x=\frac{2}{5}
Swap sides so that all variable terms are on the left hand side.
x=\frac{\frac{2}{5}}{0.16}
Divide both sides by 0.16.
x=\frac{2}{5\times 0.16}
Express \frac{\frac{2}{5}}{0.16} as a single fraction.
x=\frac{2}{0.8}
Multiply 5 and 0.16 to get 0.8.
x=\frac{20}{8}
Expand \frac{2}{0.8} by multiplying both numerator and the denominator by 10.
x=\frac{5}{2}
Reduce the fraction \frac{20}{8} to lowest terms by extracting and canceling out 4.