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The radius of a circle is 5 cm. 3 x plus 7 represents the length of the diameter. Write an equation for x. Then find the value of x.

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The diameter of the circle is twice the radius, so the equation for x would be:

3x + 7 = 2(5)

Now, solve for x:

3x + 7 = 10
3x = 3
x = 1

Therefore, the value of x is 1 cm.

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