Question

8.5-(x-9)=10

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Answer 1

8.5-(x-9)=10

40-(x-9)=10

x-9=40-10

x-9=30

x=30+9

x=39

Answer 2

8.5-(x-9)=10

40-(x-9)=10

x-9=40-10

x-9=30

x=30+9

x=39

Answer 3

8.5-(x-9)=10

x=40-(x-9)=10

x=(40-10)-9

x=30-9

x=27