What is the value of x in the equation 7 x plus 2 y is equal to 48 , when y is equal to 3 ?

Substitute y = 3 into the equation: 7x + 2(3) = 48, so 7x + 6 = 48. Subtract 6 from both sides to get 7x = 42, then divide by 7 to find x = 6. The correct choice is D, x is equal to 6.

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