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First you define what 1 is:
1, a singular unit, the lowest whole number.
Then you define what + is:
The function of addition, the sum.
Then you define what = is:
The function of equality, the quality of being the same
Then you define what 2 is:
The lowest even number.
Then you define what 3 is:
The lowest prime number.
Those are just the basics, of course you would need to define the system they function in and other pertinent respective functions/definitions.
From that you form the questions.
Who/What statement of the two is true: 1+1=2 or 1+1=3?
Evidently once you understand the grammar you can answer the question:
1 added to 1 is the same as 2, the first statement is true.
1 added to 1 is the same as 3, the second statement is false.

You believe nobody on statements of truth, you can validate truth yourself, belief is not a prerequisite to finding truth, a prerequisite is grammar, you need to understand the grammar or the definition/meaning of the terms used and the you can use critical thinking and logic to come to the conclusion.

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