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BartSMP [9]
4 years ago
13

5a-{3b-{4a-(5b-6a-7b)}]

Mathematics
1 answer:
saul85 [17]4 years ago
4 0
5a-[3b-\{4a-(5b-6a-7b)\}]\\\\=5a-[3b-\{4a-(-6a-2b)\}]\\\\=5a-[3b-\{4a+6a+2b\}]\\\\=5a-[3b-\{10a+2b\}]\\\\=5a-[3b-10a-2b]\\\\=5a-[b-10a]\\\\=5a-b+10a\\\\\boxed{=15a-b}
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