Question

if an angle is 6 less than twice its supplement find their measures

Answer 1

let one angle be x
then acc to your question second angle=2x-6
and as they are supplementary angles so their sum is 180
so x+2x-6=180
3x=186
so x is 62
therefore one angle is 62 and other becomes 62*2-6 that's 118
Hope u got your answer
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Answer 2

I am not sure but will try to answer
let angle be x
supplement =180-x
x=2(180-x)-6
x=360-2x-6
x+2x=354
3x=354
x=118