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3a-a = 4-4
2a=0
a=0
(3a+4)²=(3a+2)²+(a+4)²
9a²+24a+16=9a²+12a+4+a²+8a+16
24a=12a+a²+8a+4
24a-20a+=a²+4
4a=a²+4
4-4=a²/a
a=0