Answer
$$-4d^8-3+5d^4-8d^8+7=-12d^8+5d^4+4$$
Explanation
| $$ \begin{aligned}-4d^8-3+5d^4-8d^8+7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-12d^8+5d^4+4\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-4d^8} \color{red}{-3} +5d^4 \color{blue}{-8d^8} + \color{red}{7} = \color{blue}{-12d^8} +5d^4+ \color{red}{4} $$ |
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