Evaluate 9

Evaluate expression:

3 { 4 − 4 ( 5 − 12 ) } + 20

Correct answer:

x =  116

Step-by-step explanation:

a=5−12=−7 b=4⋅ a=4⋅ (−7)=−28 c=4−b=4−(−28)=32 d=3⋅ c=3⋅ 32=96  x=d+20=96+20=116   Verifying Solution:   x1=3⋅ (4−4⋅ (5−12))+20=116

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