Equals anything... x is a variable. If that equation was set equal to zero then you could solve for x, but that is not what you have asked.
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The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
x2 + 10x + 21 = (x + 3)(x + 7)
-2
-7.5?
(2-r)e-rr