$\"\"$

The equation is $\"\"$ .

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

$\"\"$ (Subtract 20 from each side)

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

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

Check:

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

$\"\"$

16 = 16 (Add: $\"\"$ )

The equality is true $\"\"$

Graph the solution on a number line

$\"graph$ $\"\"$

The value of $\"\"$ .