$\"\"$

The equation is $\"\"$ .

According to subtraction property of equality: if $\"\"$ , then $\"\"$ .

$\"\"$ (Subtract 10 from each side)

$\"\"$ (Apply commutative property: a + b = b + a)

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

Check:

To check the solution substitute the value of $\"\"$ in above equation.

$\"\"$

$\"\"$ (Product of two different signs is negative)

9 = 9 (Subtract: $\"\"$ )

The equality is true. \ \ $\"\"$

Graph the solution on a number line $\"graph$ $\"\"$

The value of $\"\"$ .