Answer
1st blank: $20$
2nd blank: 6
3rd blank: $2$
Work Step by Step
To find the first blank, subtract ($14x$) $-$ ($-6x$), which is the same as $14x$ $+$ $6x$. That gets you $20x$. But because after the blank, you already have an $x$, you only need to write $20$ as you answer.
To find the second blank, subtract ($-4$) $-$ ($2$). That gets you $-6$. But because before the second blank the book already puts a $-$, you only need to write $6$ to fill in the blank.
To find the third blank, you subtract ($5x^{2}$) $-$ ($3x^{2}$). That gets you $2x^{2}$.
But because after the blank there is already an $x^{2}$, you need to only write $2$ for your answer.
