Using the digits 1 to 9 at most one time each, fill in the box to make a true equation where x has the greatest possible value. The blanks next to each other create a two-digit- number like 10 and 27
There are many possible answers including –9 + 8 = -4 – (-3) and –-4 + 6 = 8 – (-2). Note that I underlined the integers I used as the negative signs made it a bit confusing.
