D. 7
ExplanationStep 1: Add the two equations. Step 2: 2x = 12 + 2 = 14, so x = 7. Step 3: Adding x+y and x-y is a quick way to find x.
Step 1: दोनों equations को add करें। Step 2: 2x = 12 + 2 = 14, इसलिए x = 7। Step 3: x निकालने के लिए x+y और x-y को जोड़ना तेज तरीका है।
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