Answer:
6. 180= (90+30)/5 x=12
7. 180= (33+29)/2 x=31
8. 180= (132+21)/3 x=51
9. 180= 4x x=45
10.180= (x-2)+x+72 x=55
11.180= 20x x=9
12.180= (3.5x+2.5x)+90 x=15
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