x^2=(x+3)^2-21
9+6x=21
6x=12
x=2 x+3=5 P=5*4=20
P=4x=8
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x^2=(x+3)^2-21
9+6x=21
6x=12
x=2 x+3=5 P=5*4=20
P=4x=8