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3x=19.3-7
Subtract 7 from both sides.
3x=12.3
Subtract 7 from 19.3 to get 12.3.
x=\frac{12.3}{3}
Divide both sides by 3.
x=\frac{123}{30}
Expand \frac{12.3}{3} by multiplying both numerator and the denominator by 10.
x=\frac{41}{10}
Reduce the fraction \frac{123}{30} to lowest terms by extracting and canceling out 3.