Question

78+b =40

Answer 1

Are you trying to find the value of b? If so, subtract 78 from both sides to give you b alone on the left side, and its value on the right side. As long as you do the same thing to both sides of the equation, it remains correct.

Answer 2

I have it work it out

Answer 3

It's not going to work itself out :-)

Answer 4

\[78 + b - 78 = 40 - 78\]\[b = 40 -78 = ?\]