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Add x/11 to each side of the equation to isolate a:
10ac - x/11 + x/11 = 3 + x/11

Cancelling the x/11 on the left side, we get:
10ac = 3 + x/11

Divide each side by 10c to isolate a:
10ac/10c = 3 + x/11

Cancelling the 10c on the left side, we get:
a = 3/10c + x/110c

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