Let the number = x
The five times the number will be 5x
15 more than five times a number will be = 5x + 15
the difference between -57 and three times the number will be -57 - 3x
So,
[tex]5x+15=-57-3x[/tex]Solve for x:
[tex]\begin{gathered} 5x+3x=-57-15 \\ 8x=-72 \\ \\ x=-\frac{72}{8}=-9 \end{gathered}[/tex]So, the answer will be the number = -9
