What is the first step in solving the equation 3 point 5 n plus 6 point 4 is equal to 42 point 5 ?

To solve 3.5n + 6.4 = 42.5, first undo the addition of 6.4. Subtract 6.4 from both sides, leaving 3.5n by itself on the left; then you can divide both sides by 3.5 to find n. So the first step is to subtract 6.4 from each side.

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