3 х - 12 = 5 х - 31

How do I solve this

Graph each integer or set integers on a number line.

Mark, Taylor, & Brian's ages are consecutive whole numbers. Mark is the youngest, and Brian is the oldest. The sum of their ages is 111. How old is Taylor?

What are the both of the x in the equation = 5x + 7 = 9x - 2?

Round 0.0936 to the nearest one

The diameter of a bowling ball is 12.57 centimeters. What is this value rounded to the nearest tenth of a centimeter?

A submarine's elevation changes - 657 feet over a period of 6 minutes. If the submarine descended at a constant rate, what is the approximate elevation change per minute? -130 feet -90 feet -120 feet -110 feet

A backpack regularly Price for $120 was marked down to $84. What was the backpack's percent of discount?

The 2000 population of a city was 724 ,000 and was increasing at the rate of 1.46 % each year. At that rate, when will the population be 1 million? The 2000 population of a city was 724 ,000 and was increasing at the rate of 1.46 % each year.

Emma is training for a 10 kilometer race. She wants to beat her last 10 kilometer time, which was 1 hour 10 minutes Emma has already run for 55 minutes.

The perimeter of a rectangular painting is 264 centimeters. If the width of the painting is 55 centimeters, what is it's len?