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\frac{7\times 7}{7}-\frac{14a-28}{7}
To add or subtract expressions, expand them to make their denominators the same. Multiply 7 times \frac{7}{7}.
\frac{7\times 7-\left(14a-28\right)}{7}
Since \frac{7\times 7}{7} and \frac{14a-28}{7} have the same denominator, subtract them by subtracting their numerators.
\frac{49-14a+28}{7}
Do the multiplications in 7\times 7-\left(14a-28\right).
\frac{77-14a}{7}
Combine like terms in 49-14a+28.
11-2a
Divide each term of 77-14a by 7 to get 11-2a.
\frac{7\times 7}{7}-\frac{14a-28}{7}
To add or subtract expressions, expand them to make their denominators the same. Multiply 7 times \frac{7}{7}.
\frac{7\times 7-\left(14a-28\right)}{7}
Since \frac{7\times 7}{7} and \frac{14a-28}{7} have the same denominator, subtract them by subtracting their numerators.
\frac{49-14a+28}{7}
Do the multiplications in 7\times 7-\left(14a-28\right).
\frac{77-14a}{7}
Combine like terms in 49-14a+28.
11-2a
Divide each term of 77-14a by 7 to get 11-2a.