This is distributive property and to do distributive property, you distribute what is outside of the parenthesis to the numbers inside the parenthesis.
How-to-do:
2(8x-7)
2(8x) - 2(7)
16x-14
if you mean to simplify :
2(8x−7)
=(2)(8x+−7)
=(2)(8x)+(2)(−7)
=16x−14
