In the equation, 5x+12=-2x-7+12, what is one of the steps that should be taken to solve for x

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle