Solve Step-by-Step: 15+5-(-4)+(-9)+8-4 Using Order of Operations

Let's remember the rule:

$-(-x)=+x$

We'll write the exercise in the appropriate form:

$15+5+4+(-9)+8-4=$

Let's solve the exercise from left to right:

$15+5=20$

Now we'll obtain the exercise:

$20+4+(-9)+8-4=$

Let's solve the exercise from left to right:

$20+4=24$

Now we'll obtain the exercise:

$24+(-9)+8-4=$

Let's remember the rule:

$+(-x)=-x$

We'll write the exercise in the appropriate form:

$24-9+8-4=$

Let's solve the exercise from left to right:

$24-9=15$

$15+8=23$

$23-4=19$