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just olya [345]
4 years ago
9

Can someone explain me where this 13 came from, please? (sorry my poor english i'm brazilian)

Mathematics
1 answer:
Alekssandra [29.7K]4 years ago
7 0

Hey there,

a-7=3(b+2), we do 3 times b and 3 times 2 according to the rule.

a-7=3b+6 we change + to - and - to + when move nums from 1 side to another one.

a=3b+13 we get the solution.

Hope this helps :)

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