The equation is .
Apply addition property of equality: If a = b then a + c = b + c.
\ (Add 4 to each side)
(Apply additive inverse property:
)
(Apply additive identity property:
)
(Add:
)
Apply addition property of equality: If a = b then .
(Divide each side by 5)
(Cancel common terms)
(Divide:
)
The solution is .