$\"\"$

The equation is $\"\"$ .

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

$\"\"$ (Subtract 7 from each side)

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

y = 14 (Subtract: $\"\"$ ) $\"\"$

Check:

To check the solution substitute the value of y = 14 in above equation.

$\"\"$

21 = 21 (Add: $\"\"$ )

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

Graph the solution on a number line

$\"graph$ $\"\"$

The value of y = 14.