Start with the integer 3 and subtract 10. From the answer,subtract 1. Then multiply the answer by -3. Now subtract 20 from the answer. What do you get?

According to the question,
= {[(3-10)-1](-3)}- 20
= {[(-7)-1](-3)}- 20
= {[-8](-3)}- 20
= {24}-20
= 24 - 20
= 4

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