Combining like terms. Game on.

The constants $7$ and $2$ are like terms: $7 + 2 = 9$. The term $m^{2}$ stays the same, so the expression is equivalent to $m^{2} + 9\textsf{.}$

The constants $3$ and $8$ are like terms: $3 + 8 = 11$. The term $w$ stays the same, so the expression is equivalent to $w + 11\textsf{.}$

The constants $12$ and $5$ are like terms: $12 + 5 = 17$. The term $p$ stays the same, so the expression is equivalent to $p + 17\textsf{.}$

The terms $2y$ and $3y$ are like terms: $2y + 3y = 5y$. The constant $6$ stays the same, so the expression is equivalent to $5y + 6\textsf{.}$

The terms $4x$ and $x$ are like terms: $4x + x = 5x$. The constant $9$ stays the same, so the expression is equivalent to $5x + 9\textsf{.}$

The constants $10$ and $-4$ are like terms: $10 - 4 = 6$. The term $t^{2}$ stays the same, so the expression is equivalent to $t^{2} + 6\textsf{.}$

The constants $15$ and $-7$ are like terms: $15 - 7 = 8$. The term $r^{2}$ stays the same, so the expression is equivalent to $r^{2} + 8\textsf{.}$

The constants $8$ and $2$ are like terms: $8 + 2 = 10$. The term $3z$ stays the same, so the expression is equivalent to $3z + 10\textsf{.}$