A.
7x-140=x+4
6x=144
x=24
First, distribute the left side:
7 * (x - 20) = 7x - 140
The right side remains the same. Now, put it together:
7x - 140 = x + 4
Subtract x from both sides:
6x - 140 = 4
Add 140 to both sides:
6x = 144
Divide by 6:
x = 24, or choice (A).
