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Irina-Kira [14]
3 years ago
9

Please help overall easy

Mathematics
1 answer:
ikadub [295]3 years ago
8 0

Answer:

x=2

Step-by-step explanation:

f(x)=6x+9

21=6x+9

21-9=6x

12=6x

12/6=x

2=x

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