The expression left and right means everywhere without any plan or pattern. Another definition of this expression means on both sides, on all sides and everywhere.
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In mathematics, such expressions indicate that the value of the expression to the left of the equal sign has the same value as the expression to the right of the equal sign. In some cases, it can also be interpreted to mean that the expression on one side of the equal sign can be used in place of the expression on the other side of the equal sign (say in manipulating algebraic expressions). In computer languages, the equal sign is sometimes also used to indicate that the value of the expression to the right of the equal sign is to be transferred to the location indicated by the expression to the left of the equal sign. The expression to the left of the equal sign is usually a single variable that represents a memory location.
You start from the left and end at the right
The usual rules are: * Evaluate anything within parentheses first. * Evaluate multiplications and divisions from left to right. * Then evaluate additions and subtractions from left to right.
Instead of reading the numbers from left to right (1234) read them from right to left (4321).
It does not mean anything in particular.