We would evaluate each expression.
For F,
13 + (16 - x) = 13 + 16 - x = 29 - x
(16 + x) + 13 = 16 + 13 + x = 29 + x
For G,
x + (4 * 5) = x + 20
(x + 4) * 5 = x * 5 + 4 * 5 = 5x + 20
For H,
7(10 + x) = 7 * 10 + 7 * x = 70 + 7x
(7 * 10) + x = 70 + x
For J,
(8 + x) + 9 = 8 + 9 + x = 17 + x
8 + (x + 9) = 8 + x + 9 = 8 + 9 + x = 17 + x
Thus, we can see that option J has equivalent expressions