Answer
$$14cd-2c^2d^2+15cd+5c^2d^2-15cd=3c^2d^2+14cd$$
Explanation
| $$ \begin{aligned}14cd-2c^2d^2+15cd+5c^2d^2-15cd& \xlongequal{ }14cd-2c^2d^2+ \cancel{15cd}+5c^2d^2 -\cancel{15cd} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3c^2d^2+14cd\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{14cd} \color{red}{-2c^2d^2} + \, \color{green}{ \cancel{15cd}} \,+ \color{red}{5c^2d^2} \, \color{green}{ -\cancel{15cd}} \, = \color{red}{3c^2d^2} + \color{green}{14cd} $$ |
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