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4x=12.5-7.1
Subtract 7.1 from both sides.
4x=5.4
Subtract 7.1 from 12.5 to get 5.4.
x=\frac{5.4}{4}
Divide both sides by 4.
x=\frac{54}{40}
Expand \frac{5.4}{4} by multiplying both numerator and the denominator by 10.
x=\frac{27}{20}
Reduce the fraction \frac{54}{40} to lowest terms by extracting and canceling out 2.