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11 November, 19:31

What belongs in the box marked with the question mark in the proof?

Given: 3x - 4 = 2 (x + 8), Prove: x = 20

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  1. 11 November, 19:51
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    the blank boxes are for you to plug in x=20 to prove its right. so it would be 3 (20) - 4=2 (20+8) 60-4=2 (28) 56=56 so its true!
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