Answer
$$21y\cdot1-70y\cdot2+2x+5=2x-119y+5$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}21y\cdot1-70y\cdot2+2x+5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21y-140y+2x+5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-119y+2x+5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}2x-119y+5\end{aligned} $$ | |
| ① | $$ 70 y \cdot 2 = 140 y $$ |
| ② | Combine like terms: $$ \color{blue}{21y} \color{blue}{-140y} = \color{blue}{-119y} $$ |
| ③ | Combine like terms: $$ -119y+2x+5 = 2x-119y+5 $$ |
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