The expression is .
According to subtraction property of equality: if , then .
(Subtract 5k from each side)
(Commutative property: a + b = b + a)
(Additive inverse property: )
(Subtract: )
According to division property of equality: if , then .
(Divide each side by negative 3)
(Cancel common terms)
(Divide: )
The value .
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