12-7*6+19-14=11

You want to think about order of operations - PEMDAS.  Since you are working toward a result, I would just do guess and check. It's a tricky one! You will need nested sets...paratheses within paratheses.

Add the parentheses based on highest order of operation, then left to right.

example:

• 4-3*7-12/6+2 = x
• 4-(3*7)-(12/6)+2 = x  Multiplication and division are higher order than add and subtract, but                                      the same as each other so they are left to right.
• (((4-(3*7))-(12/6))+2) Addition and subtraction are the same order of precedence so they are                                       just done left to right.

Hope this example helps,

Steven P.