A congruence check asks whether two values are equivalent under a given modular condition. The key idea is to compare the values after reducing them in the same way, so you can decide if they match under that condition.
Identify the modulus or the rule being used. This tells you what kind of reduction to perform.
Compute each expression in the simplest form allowed by the condition. If there is a remainder-style calculation, keep only the relevant part for the comparison.
If both reduced forms are the same, the congruence statement is true. If they differ, it is false.
Give the result in its simplest exact form. If the exercise asks for a yes/no decision, state it directly and clearly.
Substitute or recompute the reduction once more to make sure both sides were handled the same way. A common mistake is reducing one side correctly and the other side incompletely.
When numbers or expressions look different at first, focus on their reduced forms. Congruence is about whether they behave the same under the given rule, not whether they look identical initially.
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