Solve for x
x = \frac{640}{21} = 30\frac{10}{21} \approx 30.476190476
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2.1x=64
Multiply 3 and 0.7 to get 2.1.
x=\frac{64}{2.1}
Divide both sides by 2.1.
x=\frac{640}{21}
Expand \frac{64}{2.1} by multiplying both numerator and the denominator by 10.
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