Answer
$$4(2z-1)-5z=3z-4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4(2z-1)-5z& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8z-4-5z \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}3z-4\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4} $ by $ \left( 2z-1\right) $ $$ \color{blue}{4} \cdot \left( 2z-1\right) = 8z-4 $$ |
| ② | Combine like terms: $$ \color{blue}{8z} -4 \color{blue}{-5z} = \color{blue}{3z} -4 $$ |
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