Substitute the values for $a=7$ and $b=-4$ to find the value of given expression.

$\left|3b-3a\right|$

Substitute the value of $b=-4$ . find the value of given expression.

$\left|b^3\right|$

Substitute the values for $a=-5$ and $b=3$ to find the value of given expression.

$a+\left|a+b\right|$

Substitute the values for $a=-5$ and $b=3$ to find the value of given expression.

$-a+\left|a-b\right|-b$

Substitute the values for $a=-5$ and $b=3$ to find the value of given expression.

$a+\left|a\right|+b+\left|b\right|$

Substitute the values for $a=-5$ and $b=3$ to find the value of given expression.

$3a-\left|a\right|$

Substitute the values for $a=-5$ and $b=3$ to find the value of given expression.

$3b-\left|b\right|$

Substitute the values of  $a=-5$ to find the value of given expression.

$\left|a^4\right|$

Substitute the values for $a=1$ and $b=-1$ to find the value of given expression.

$a+\left|a\right|+b+\left|b\right|$