Three times a number, minus 5 is equal to two times the number, plus 7

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

What is r i 4.5+10r=-6.5 with work pls

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?