4d+12=d+21

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Solution for 4d+12=d+21 equation:


Simplifying
4d + 12 = d + 21

Reorder the terms:
12 + 4d = d + 21

Reorder the terms:
12 + 4d = 21 + d

Solving
12 + 4d = 21 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
12 + 4d + -1d = 21 + d + -1d

Combine like terms: 4d + -1d = 3d
12 + 3d = 21 + d + -1d

Combine like terms: d + -1d = 0
12 + 3d = 21 + 0
12 + 3d = 21

Add '-12' to each side of the equation.
12 + -12 + 3d = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3d = 21 + -12
3d = 21 + -12

Combine like terms: 21 + -12 = 9
3d = 9

Divide each side by '3'.
d = 3

Simplifying
d = 3

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