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angle A and angleB are supplements of ea...

`angle A` and `angleB` are supplements of each other. If `mangleB=(x+20)^@`, then find `mangleA`.

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Let `mangleA=Y^@`. The sum of the measures of supplementary angles is `180^@`.
`therefore` x+20+y=180
`therefore` y=180-x-20
`therefore` y=160-x
`mangleA=(160-X)^@`
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