Solve for x
x=50
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20=0.4x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
0.4x=20
Swap sides so that all variable terms are on the left hand side.
x=\frac{20}{0.4}
Divide both sides by 0.4.
x=\frac{200}{4}
Expand \frac{20}{0.4} by multiplying both numerator and the denominator by 10.
x=50
Divide 200 by 4 to get 50.
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