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B
x=1.
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C
x=3.
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D
13×x=3.
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Solution
The correct option is Cx=3. Consider equation 30x+10=40. Divide the equation by 10, we get, 3x+1=4. Subtract 1 from both sides, we get, 3x=3. Divide 3 on both sides, we get, x=3.