$\"\"$

The sum of a number and additive inverse is zero.

$\"\"$

$\"\"$ (Subtract 3.8 from each side)

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

The product of a number and multiplicative inverse is one.

$\"\"$

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Cancel common terms) \ \ $\"\"$ $\"\"$

$\"\"$ .