Question

7-y-y= -1 what does y equal?

Answer 1

7-2y = -1 (-y-y is the same as (-y) + (-y) = -2y)
7-2y-7 = -1-7 (subtract -7 from both sides)
-2y = -8

-2y/-2 = -8/-2 (divide both sides by -2)

y = 4