Answer
$$7-7+5x-5x+2+2x^2+2x=2x^2+2x+2$$
Explanation
| $$ \begin{aligned}7-7+5x-5x+2+2x^2+2x& \xlongequal{ } \cancel{7} -\cancel{7}+ \cancel{5x} -\cancel{5x}+2+2x^2+2x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^2+2x+2\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{7}} \, \, \color{green}{ -\cancel{7}} \,+ \, \color{orange}{ \cancel{5x}} \, \, \color{red}{ -\cancel{5x}} \,+ \color{green}{2} +2x^2+ \color{red}{2x} = 2x^2+ \color{red}{2x} + \color{green}{2} $$ |
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