What are the steps to this equation to -2x-4+5x=8

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Can someone answer this question for me