When the number is divided by , what is the remainder?We have positive integers $a,$ $b,$ and $c$ such that $a > b > c.$ When $a,$ $b,$ and $c$ are divided by $19$, the remainders are $4,$ $2,$ and $18,$ respectively. When the number $2a + b - c$ is divided by $19$, what is the remainder?
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