6n+9=-3n-21-6
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1 answer:
6n + 9 = -3n <u>-21 -6</u>
<u>6n</u> + 9 = <u>-3n</u> -27
+3n +3n
9n <u>+9</u> = <u>-27</u>
-9 -9
<u>9n</u> = <u>-36</u>
<u>Divide by 9 on both sides</u>
n = -4
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