Answer:
[tex](-2x-4)[/tex]
Step-by-step explanation:]
Given data
we are given that the expression is
the first expression is[tex](3x + 7)[/tex]
the second expression is[tex](2x +4)[/tex]
[tex](3x + 7) - (2x +4)[/tex]
When we open bracket the second expression becomes
[tex](-2x-4)[/tex]