Respuesta :

ellie55555
the answer is a=7 :)
ahhmaya

Answer: 7

Step-by-step explanation:

3a + 4 = 21

Step 1 subtract 4 from both sides.

3a+4−4=25−4

3a = 21

Step 2: Divide both sides by 3.

3a / 3 = 1

21 / 3 = 7

a = 7

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