We pull the Greatest Common Factor (GCF) "2^2*7x" in front of the brackets and then apply Zero Product Theorem.

Zero Product Theorem states: A product of factors is zero if and only if one or more of the factors is zero.

In your case: 

So you obtain the solutions:

x1 = 0 

x2 = 2 (from solving x - 2 = 0)