Hi there! Hopefully this helps!
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Answer:
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Swap sides so that all variable terms are on the left hand side.

Subtract 5 from both sides.

Subtract 5 from −30 to get −35.

Divide both sides by 5.

Divide −35 by 5 to get, you guessed it, -7!
You can also do "5(-7) + 5 = ??" For proof.