The original function is
Write as
or
First solve the case .
Apply Addition property of equality: if a = b, then a - c = b - c.
\ (Add 7 to each side)
(Additive inerse property:
)
(Additive identity property:
) \ \
(Add:
)
(Divide each side by 6)
(Cancel common terms)
Next solve the case .
(Product of two same signs is positive)
(Add 7 to each side)
(Additive inerse property:
)
(Additive identity property:
) \ \
(Add:
)