`(a)` We go stepwise to separate the variable n on the `LHS` of the equation. The `LHS` is
`3n + 7`. We shall first subtract `7` from it so that we get `3n`. From this, in the next step
we shall divide by `3` to get n. Remember we must do the same operation on both
sides of the equation. Therefore, subtracting `7` from both sides,
`3n + 7 – 7 = 25 – 7` `3n = 18` Now divide both sides by `3`, `(3n)/7= 18/3` `n=6` `(b)` What should we do here? First we shall add `1` to both the sides:
`2p – 1 + 1 = 23 + 1` `2p = 24` Now divide both sides by `2`, we get `(2p)/2=24/2` `p=12`
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