Without the proper use of parenthesis, brackets ([]) and or braces ({}) there will be doubts on the part of the answerer as to what the asker is trying to achieve.
when we have this kind of expression or when we have to evaluate the mathematical expression then we use BODMAS RULE
BO=> Bracket off
D=>Divide
M=>Multiply
A=>Addition
S=>Subtraction
In the above order we solve the expression
so
in your question first of all we solve divide and then addition and finally subtraction look as follows
6 - 4/12 + 8/6
=>6 - 0.33 + 1.33
=> 7.33 -0.33
=> 7.00 (answer)