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To solve for x, we need to isolate it on one side of the equation. Here's how to do it step-by-step:
21.3 = x + 5.1
First, let's subtract 5.1 from both sides of the equation to isolate x:
21.3 - 5.1 = x + 5.1 - 5.1
16.2 = x
Therefore, the solution to the equation is x = 16.2.