Add $3$ to both sides to get the variable by itself.

$\begin{align*}2x−3&=7 \\ +3 &+3\end{align*}$

$2x = 10$

Solve for $x$.

$x = 5$

Combine like terms.

Follow the steps in part (a).

How does the negative sign in front of the parentheses change what is inside it?

Follow the steps in part (b).

Follow the steps in part (b).

$x = −18$