Here,

Let x= (42 * Q) + 19 (since dividend/divisor = quotient +reminder ; and Q= any positive number)

x = (42 * 2) +19 =103

since 103/42 gives a quotient 2 and reminder 19.

Now
103/7 gives a quotient 14 and reminder 5

This applies to any positive value of Q, hence reminder when \(\frac{x}{7}\) will always be 5
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Added the OA

regards