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30-10-2020
Mathematics

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Given f(x)=3x+9, find x when f(x)=21

Respuesta :

30-10-2020

Answer:

x=4

Step-by-step explanation:

First do(just do the opposite. It is +9 you do -9) 21-9=12

Second do 12÷3=4 (opposite of multiple is divided)

x=4

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