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If (4446)x + (2222)x = (10001)x then value of (2342)x - (1656)x = (?)x

how to solve these kinds of questions?

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(4446)base x + (2222)base x=(10001)base x

now if you see closely when we adding 6+2=8 which is greater than 7 we are getting 1(8-7) and 1 will we the carry and after doing that we will get same output as 10001 at base 7

now to solve (2342)base 7 - (1656) base 7=(353)base 7

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