$\"\"$

The equation is $\"\"$ . \ \

$\"\"$ (Multiply each side by multiplicative inverse of $\"\"$ )

$\"\"$ (Multiply: $\"\"$ )

The solution is 40. $\"\"$

Check:-

Substitute $\"\"$ in the equation.

$\"\"$ (Write the equation)

$\"\"$ (Substitute: $\"\"$ )

$\"\"$ (Simplify: $\"\"$ ) $\"\"$

The solution is 40.