4d=2d+21

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Solution for 4d=2d+21 equation: 


Simplifying
4d = 2d + 21

Reorder the terms:
4d = 21 + 2d

Solving
4d = 21 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
4d + -2d = 21 + 2d + -2d

Combine like terms: 4d + -2d = 2d
2d = 21 + 2d + -2d

Combine like terms: 2d + -2d = 0
2d = 21 + 0
2d = 21

Divide each side by '2'.
d = 10.5

Simplifying
d = 10.5

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