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