Problems 15-23
These problems require more than one operation, as shown in Example 2. First, make
sure that the expression on the left side of the equal sign is simplified, and then
make sure the expression on the right side of the equal sign is simplified.
Remember the simplified order of operations is first mult/divide and then add/sub....
to reverse this process (which is what we are doing when solving an equation), generally,
you should add/sub the same number to both sides and then multiply/divide
both sides by the same (nonzero) number.
Note: Homework Hints are given only for the levels 1 and 2 problems.