10d+21=7d

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Solution for 10d+21=7d equation:


Simplifying
10d + 21 = 7d

Reorder the terms:
21 + 10d = 7d

Solving
21 + 10d = 7d

Solving for variable 'd'.

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

Add '-7d' to each side of the equation.
21 + 10d + -7d = 7d + -7d

Combine like terms: 10d + -7d = 3d
21 + 3d = 7d + -7d

Combine like terms: 7d + -7d = 0
21 + 3d = 0

Add '-21' to each side of the equation.
21 + -21 + 3d = 0 + -21

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

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

Divide each side by '3'.
d = -7

Simplifying
d = -7

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