
The equation is 
(Product of two same signs is positive)
According to subtraction Property of equality: If a = b then
(Add 16 to each side)
(Commutative property:
)
(Additive inverse property:
)
(Add:
)
Check:
\To check the solution, substitute
in original equation.

(Product of two same signs is positive)
(Product of two different signs is negative)
(Subtract:
)
Compare the values, the equation is true.
\The value of 