If x − a2 + x − b2 + x − c2= 4(a

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If x − a² + x − b² + x − c² = 4(a + b + c), then x is equal to
b + c c + a a + b

Check through option
When x = (a + b + c)²,

x − a²	+	x − b²	+	x − c²
b + c	+	c + a	+	a + b

=	(a + b + c)² − a²	+	(a + b + c)² − b²	+	(a + b + c)² − c²
	b + c		c + a		a + b

=	(2a + b + c)(b + c)	+	(a + 2b + c)(c + a)	+	(a + b + 2c)(a + b)
	b + c		c + a		a + b

= 2a + b + c + a + 2b + c + a + b + 2c
= 4a+4b + 4c = 4 (a + b + c) = RHS.