You have to use the Periodic Table of elements.
P E M D A S
P - ( ) _Parenthesis
E - y2 _Exponents
M - X _Multiplication
D - / _Division
A - + _Addition
S - [-] _Subtraction
•6+2x4-2•
Multiplication comes fist so... 2 x 4 = 8
Addition comes next so... 6 + 8 = 14
Subtraction is last so... 14 - s = 12
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