Simplify each term.

Apply the distributive property.

Multiply by .

Subtract from .

Subtract from both sides of the equation.

Subtract from .

Add to both sides of the equation.

Add and .

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Divide by .

Solve for a 2-2(a+2)=7+a