if the supplement of an angle is 3 times its complement then angle is
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180-x=3(90-x)
180-x=270-3x
-x+3x=270-180
2x=90
x=90÷2
x=45
180-x=270-3x
-x+3x=270-180
2x=90
x=90÷2
x=45
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