Question 230361
The supplement of an angle is 21 less than four times the complement of the angle. 
Find the measure of the angle, the complement, and the supplement. 
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You're just a little mixed up here, the equation should be:
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Supple is 4*Compl less 21
180 - x = 4(90-x) - 21
:
180 - x = 360 - 4x - 21
:
-x = 4x = 360 - 21 - 180
:
3x = 159
x = {{{159/3}}}
x = 53 degrees
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Now find the comp and suppl, check solution in the original equation