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a(b-c)+b(a-c)=2(ab-ac-bc+c²)
ab-ac+ab-bc= 2ab-2ac-2bc+2c²
2ab-2ab-ac+2ac-bc+2bc=2c²
ac+bc=2c²
c(a+b)=2c²
c*2c=2c²
2c²=2c²
L=P