Question

what wrong with this equation ?
2(n+1.5)=4.5
2n=6
n=3
please help

Answer 1

So, let's start at the beginning.

$$ 2(n + 1.5) = 4.5 $$

You can distribute the 2:

$$ \begin{align}
2n + 2 \cdot (1.5) &= 4.5\\
2n + 3 &= 4.5\\
\end{align} $$

Can you see how that does not lead to \(2n = 6\), and therefore your final answer isn't right?