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2a plus 21 equals 8a-9

Anonymous

∙ 16y ago

Updated: 12/21/2022

2a + 21 = 8a - 9

Add 9 to each side:

2a + 30 = 8a

Subtract 2a from each side:

30 = 6a

Divide each side by 6:

5 = a

Wiki User

∙ 16y ago

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depends what 'a' =

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a + a + a - 2a = 3a - 2a = a

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