21=5-3=7-9*2=
If you would like to have an answer, you would be wise to post something meaningful.
What was posted is not an equation, nor an expression, nor a series. There is no description of what help is required.
Please clarify.
To evaluate the expression 21=5-3=7-9*2=, we need to follow the order of operations (also known as PEMDAS: Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction) and simplify it step by step.
Step 1: Evaluate multiplication
Let's start with 9*2, which equals 18.
21=5-3=7-18
Step 2: Perform addition and subtraction from left to right
Next, we simplify 7-18, which results in -11.
21=5-3=-11
Step 3: Continue with the remaining operations
Finally, we simplify 5-3, which equals 2.
21=2=-11
In the given expression, the sequence of calculations does not hold true:
21 ≠ 5 - 3 ≠ 7 - 9 * 2
Please double-check the expression or provide additional context if needed.