18 + 18 + 18 + 18 - 24 + 1 + 3 + 5 + 7 + 20 - 23 =?
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So for this, we will be applying the <u>zero product property</u>, which is <u>"if a x b = 0, then either a = 0 or b = 0 or both a and b = 0"</u>. In this case, a = x + 13 and b = x - 7. Solve them separately:
<u>Your answer is x = -13 and 7.</u>