1/2(x - 7) = 11
Distributive property.
0.5x - 3.5 = 11
Add 3.5 to both sides.
0.5x = 14.5
Multiply both sides by 2.
x = 29. (This is your answer.)
We can plug 29 into the original equation to verify.
1/2(x - 7) = 11
1/2(29 - 7) = 11
1/2(22) = 11
11 = 11 √ This is correct.