Since the product of x−6 and x+0.7 equals 0, by the zero product property either x−6=0or x+0.7=0.Therefore, the solutions to the equation are 6 and −0.7. The sum of 6 and −0.7 is 5.3.Choice A is incorrect and is the result of subtracting 6 from −0.7 instead of adding. Choice B is incorrect and may be the result of erroneously calculating the sum of −6 and 0.7 instead of 6 and −0.7. Choice D is incorrect and is the sum of 6 and 0.7, not 6 and −0.7.