Explanation:
step 1. if the distributive property works for 3*(5+ -5) then since 5 + -5 = 0 then 3*0 =0
step 2. let's give it a try
step 3. 3*(5 + -5) = 3*5 + 3*(-5) distributive property
step 4. 15 + -15 = 15 - 15 = 0 (yes it works).
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