Evaluating Algebraic Expressions: Simplifying Techniques

What is the result of x + 4 when x equals 7?

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If y is 12, what is the value of 20 - y?

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Calculate 3t + 9 when t is 4.

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If t is 4, what is the result of 3t + 9?

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What is the value of 30 - 5R when R equals 5?

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