the operation can be performed in pascaline is addition and subtraction..
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Brackets (or parentheses) Order (or powers) Division Multiplication Addition Subtraction.
Left to right.
Not really. It's entirely arbitrary that multiplication is done before addition. We could imagine a system in which addition is done first: in this system, 2*3+5 would be 2*8 or 16, and if people wanted the other order, they'd write (2*3)+5. The reason for the order of operations that everyone uses is mostly tradition, but it also makes sense because you usually want to multiply before you add.
An operator is "a symbol or function representing a mathematical operation." In other words, it's the symbol telling you what should be done in the equation, (i.e., add, subtract, multiply, divide...)
Subtract 20 from each side: n= 6. Job done. You could have done that!