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a+b+c=180 reemp.
c=3a/4 b=a+4
b=a+4 b=64+4
reemp. b=68
a+(a+4)+3a/4)=180
4a+4(a+4)+3a=4(180) c=3a/4
11a+16=720 c=3(64)/4
11a=704 c=48
a=64