How do I solve (|x-3|+5|x|) ?

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?