BODMAS. Brackets, Order, Division, Multiplication, Addition & Subtraction.
If the problem has numbers in brackets - solve those first (following the rules for the symbols in the bracketed part). Then numbers raised to a power (ordered) come next, followed by division, multiplication, addition and finally subtraction.
For example... to solve (2x62)-3/4...
The sum inside the brackets come first... 62 = 36 times that by the 2 = 72
The sum 3/4 equals 0.75, and you subtract that from the 72 obtained in the first sum.. to give the answer 71.25
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Yes. It is a part of every subject in which you have a problem to solve.
The left lobe of your brain is the part of the brain you use to do math.
a part of a body part
Yes, because logic and deduction are part of math.
The answer is -243. You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.