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0.4x-\frac{975}{4000}=\frac{1}{2}
Expand \frac{0.975}{4} by multiplying both numerator and the denominator by 1000.
0.4x-\frac{39}{160}=\frac{1}{2}
Reduce the fraction \frac{975}{4000} to lowest terms by extracting and canceling out 25.
0.4x=\frac{1}{2}+\frac{39}{160}
Add \frac{39}{160} to both sides.
0.4x=\frac{80}{160}+\frac{39}{160}
Least common multiple of 2 and 160 is 160. Convert \frac{1}{2} and \frac{39}{160} to fractions with denominator 160.
0.4x=\frac{80+39}{160}
Since \frac{80}{160} and \frac{39}{160} have the same denominator, add them by adding their numerators.
0.4x=\frac{119}{160}
Add 80 and 39 to get 119.
x=\frac{\frac{119}{160}}{0.4}
Divide both sides by 0.4.
x=\frac{119}{160\times 0.4}
Express \frac{\frac{119}{160}}{0.4} as a single fraction.
x=\frac{119}{64}
Multiply 160 and 0.4 to get 64.