Hi there! The answer is 7.
To find our answer we need to plug in m = 5 and x = 4 into the expression.
We find the following
[tex]3m - 2x = 3 \times 5 - 2 \times 4[/tex]
Multiply first.
[tex]3 \times 5 - 2 \times 4 = 15 - 8[/tex]
Now subtract.
[tex]15 - 8 = 7[/tex]
The answer is 7.
~ Hope this helps you!