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

User Danvitoriano
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1 Answer

3 votes

Answer:

x=4

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

User Conor Svensson
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