SOLUTION: the sum of twice a number d and 3 is 12

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Question 649594: the sum of twice a number d and 3 is 12
Answer by MathLover1(20850) About Me  (Show Source):
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twice a number d is 2d
so,the sum of 2d%2B3=12
find d
2d=12-3
2d=9
d=9%2F2
d=4.5