Question

7x-4(-x)+12 if x=6

Answer 1

Well, let's plug in 6 for x.
7(6)-4(-6)+12
Next multiply out the values in parentheses by the numbers preceding them.
7(6) = 35 and -4(-6)=24 so,
35+24+12=71

Cool fact, if your original problem was set equal to 71, in other words looked like this:
7x-4(-x)+12=71
then, the solution x=6, would verify or "check" for such a problem. This is how you check to see if your answers are right!!!