I'll just do the middle one:



Combine like terms on left and right:



Add -12m to both sides:



Add 7 to both sides:



Divide both sides b 
which will reverse the inequality
since we are dividing by a negative





Now we draw this number line

--------------------------------------
-3    -2    -1     0     1     2     3

Now we draw an open circle at  
which is  of the way between 0 and 1:

---------------------o----------------
-3    -2    -1     0     1     2     3

We drew an open circle, open because it 
is >, and not >,

And since it is "greater than", we shade to
the right of the open circle:

---------------------o================>
-3    -2    -1     0     1     2     3

and put an arrow head to the right, to indicate
that it extends indefinitely far to the right.

Edwin