Hello! :)
[tex]\large\boxed{5[f(d)] = -10d - 15}[/tex]
f(x) = -2x - 3, so:
f(d) = -2(d) - 3
f(d) = -2d - 3
Multiply the expression by 5 to find 5[f(d)]:
5(-2d - 3) = -10d - 15
5[f(d)] = -10d - 15
