The HCF is the Highest Common Factor of a number in this case 54. This is the highest number times another number which = 54. The HCF for 54 is 18.
Answer:
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Step-by-step explanation:

Move 9 to right hand side and change it's sign
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Subtract 9 from 17
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Divide both sides of the equation by -4
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Calculate
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Hope I helped!
Best regards!!
Answer:
good question
Step-by-step explanation:
go to google i guess