\"\"

\

The equation is \"\".

\

Apply distributive property: \"\".

\

\"\"

\

Apply distributive property: \"\".

\

\"\"

\

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

\

Apply subtraction property of equality: If a = b then \"\".

\

\"\"   (Subtract 40 from each side) \ \

\

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

\

\"\"                   (Apply additive identity property: \"\")

\

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

\

\"\"        (Subtract 3d from each side) \ \

\

Apply commutative property of addition: \"\".

\

\"\"

\

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

\

\"\"                     (Apply additive identity property: \"\")

\

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

\

Apply division property of equality: If a = b then \"\"

\

\"\"                        (Divide each side by 2)

\

\"\"                             (Cancel common terms)

\

\"\"                               (Divide: \"\")

\

\"\"

\

\"\"

\

Check:

\

To substitute \"\" in \"\".

\

\"\"   (Substitute \"\")

\

\"\"         (Subtract: \"\")

\

\"\"               (Add: \"\")

\

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

\

The equality is true \"\"

\

The solution is \"\".