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2015-02-15T18:25:51+08:00

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180-x=50+2(90-x)
180-x=50+180-2x
x=50 or simply the complement

x+y=180
y=supplement
50+y=180
y=130

Therefore the measure of its supplement is 130 degrees. Hope this helps =)
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the x i mean is not the complement but its the angle