Question

1
ь - 1 1

`21 - b = 11`
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Answer 1

For equation 21-b=11 given in the statement

the answer is b=10

Explanation:

This is the equation: 21-b=11

If we sum '-21' to both sides of equation, we have

21-b-21=11-21, which leaves us to: -b=-10

Now lets multiply the equation from above by '-1', we obtain that b=10