1d+2d+4d+2d=18

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Solution for 1d+2d+4d+2d=18 equation: 


Simplifying
1d + 2d + 4d + 2d = 18

Combine like terms: 1d + 2d = 3d
3d + 4d + 2d = 18

Combine like terms: 3d + 4d = 7d
7d + 2d = 18

Combine like terms: 7d + 2d = 9d
9d = 18

Solving
9d = 18

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Divide each side by '9'.
d = 2

Simplifying
d = 2

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