Under the current tax plan, the person pays 26% flat income tax on their salary. Under a proposed new system, the person would pay 31% on their salary above $12,000. The person pays $980 more under the new system than the old. What is the person's salary?

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A: SOLVE FOR X   x=4-3y2+y2x=-4-3y2+y2y≤233 ​​