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marysya [2.9K]
3 years ago
12

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

Mathematics
1 answer:
koban [17]3 years ago
6 0
<span>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!</span>
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