<span><span>First distribute the numbers outside the parentheses - 7x
+ 7 + 8x - 12 = 40 - and then combine the like numbers - 15x - 5 = 40. To
isolate x, add 5 to both sides, so that 15x = 45. Solve for x by dividing both sides by 15. The answer is x =
3.</span></span>
B. It might be, as a square and a rectangle might be as well.
Answer is as shown in the picture.
