Answer
$$3x^3-7y+55x^3-8y-10y^2=58x^3-10y^2-15y$$
Explanation
| $$ \begin{aligned}3x^3-7y+55x^3-8y-10y^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}58x^3-10y^2-15y\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^3} \color{red}{-7y} + \color{blue}{55x^3} \color{red}{-8y} -10y^2 = \color{blue}{58x^3} -10y^2 \color{red}{-15y} $$ |
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