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b=a+4
c=3a+4
a²+b²=c²
(3a+2)²+(a+4)²= (3a+4)²
(9a²+12a+4)+(a²+8a+16)=(9a²+24a+16)
9a²+a²-9a²+12a+8a-24a+4+16-16=0
a²-4a+4=0
(a-2)²
a=2