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A). 31+39+x=180 (angle sum prop of triangle)
70+x=180
X=180-70=110
23+39+y=180
62+y=180
Y=180-62=118
39+40+z=180 (linear pair)
79+z=180
Z=180-79=101
70+x=180
X=180-70=110
23+39+y=180
62+y=180
Y=180-62=118
39+40+z=180 (linear pair)
79+z=180
Z=180-79=101
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