12d+7=5d+21

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Solution for 12d+7=5d+21 equation:


Simplifying
12d + 7 = 5d + 21

Reorder the terms:
7 + 12d = 5d + 21

Reorder the terms:
7 + 12d = 21 + 5d

Solving
7 + 12d = 21 + 5d

Solving for variable 'd'.

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

Add '-5d' to each side of the equation.
7 + 12d + -5d = 21 + 5d + -5d

Combine like terms: 12d + -5d = 7d
7 + 7d = 21 + 5d + -5d

Combine like terms: 5d + -5d = 0
7 + 7d = 21 + 0
7 + 7d = 21

Add '-7' to each side of the equation.
7 + -7 + 7d = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 7d = 21 + -7
7d = 21 + -7

Combine like terms: 21 + -7 = 14
7d = 14

Divide each side by '7'.
d = 2

Simplifying
d = 2

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