Step-by-step explanation:
first fill out the bracket
-7*8x = -56x
-7*-3 = 21
So the equation is now
-56x+21< 133
Now transpose to get -56x by itself
-56x+21 -21< 133-21
-56x< 112
Then transpose to get x by itself
-56x/-56< 112/-56
Therefore
x< -2
