1 P=AB+BC+AC=x+3x+3x-2=7x-2
2 12=7x-2
7x=14
x=2
AB=2
BC=6
AC=4
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1 P=AB+BC+AC=x+3x+3x-2=7x-2
2 12=7x-2
7x=14
x=2
AB=2
BC=6
AC=4