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\frac{7\times 5m}{56}-\frac{8\left(3m-3\right)}{56}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 8 and 7 is 56. Multiply \frac{5m}{8} times \frac{7}{7}. Multiply \frac{3m-3}{7} times \frac{8}{8}.
\frac{7\times 5m-8\left(3m-3\right)}{56}
Since \frac{7\times 5m}{56} and \frac{8\left(3m-3\right)}{56} have the same denominator, subtract them by subtracting their numerators.
\frac{35m-24m+24}{56}
Do the multiplications in 7\times 5m-8\left(3m-3\right).
\frac{11m+24}{56}
Combine like terms in 35m-24m+24.
\frac{7\times 5m}{56}-\frac{8\left(3m-3\right)}{56}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 8 and 7 is 56. Multiply \frac{5m}{8} times \frac{7}{7}. Multiply \frac{3m-3}{7} times \frac{8}{8}.
\frac{7\times 5m-8\left(3m-3\right)}{56}
Since \frac{7\times 5m}{56} and \frac{8\left(3m-3\right)}{56} have the same denominator, subtract them by subtracting their numerators.
\frac{35m-24m+24}{56}
Do the multiplications in 7\times 5m-8\left(3m-3\right).
\frac{11m+24}{56}
Combine like terms in 35m-24m+24.