$\"\"$

Twelve decreased by twice a number equals $\"\"$ .

Write an equation:

Let a number be $\"\"$ .

Twelve decreased by twice a number equal $\"\"$ .

$\"\"$ .

The equation is $\"\"$ .

$\"\"$

Find the number.

$\"\"$ (Original equation)

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

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

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

$\"\"$ (Cancel common terms)

Therefore, the equation is $\"\"$ and the number is $\"\"$ .

$\"\"$

The equation is $\"\"$ and the number is $\"\"$ .