Solve the equation using mental math.

$x-10=7$

An equation is a mathematical statement that two expressions are equal. The solution of an equation is the value that when substituted for the variable makes the equation a true statement.

Example: 3x + 5 = 14 is an equation, in which 3x+5 and 14 are two expressions separated by an ‘’equal’’ sign.

Step 1: Simplify each side of the equation by removing parenthesis and combining the like terms.

Step 2: Use addition or subtraction to isolate the variable term on one side (preferably in the left side).

Step 3: Use Multiplication or Division to solve for the variable.

Solving the equation $x-10=7$

step by step localid="1649157736317" $\begin{array}{l}x-10=7\\ x-10+10=7+10\text{}\left[\text{Add10tobothsides}\right]\text{}\\ x=17\end{array}$

The solution of the equation $x-10=7$

is$x=17$