Answer:
A (4x+2) + (3x+3) = 180 degrees
Explanation:
We know this because ALL lines equal 180 degrees and in a linear equation you are finding the equation for a straight line. In this question we are the length of our line on each side of the angle. You do not HAVE to use the parenthases however you can to show that they are separate measurements that will need solving before the value of x can be found.
Note in linear equations, we know the line will equal 180 degrees. HOW? Imagine that line with a circle around it. That line runs through the center dividing that circle in half. A circle measures 360 degrees, now since that line is in the center of the circle cutting it in half we know that the line would be half of 360. Knowing this will help you find not only x but the total of both angles.
Hope this helps.