-4 + x = -1
What is x = 3?
-5 = x -5
What is x = 0?
b - (-31) = 16
What is x = -15?
−4 = r/20 − 5
What is r = 20?
8 + b/−4 = 5
What is x = 12?
19b + 314 = 1663
What is 71 ?