21=-2d+7

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Solution for 21=-2d+7 equation:


Simplifying
21 = -2d + 7

Reorder the terms:
21 = 7 + -2d

Solving
21 = 7 + -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.
21 + 2d = 7 + -2d + 2d

Combine like terms: -2d + 2d = 0
21 + 2d = 7 + 0
21 + 2d = 7

Add '-21' to each side of the equation.
21 + -21 + 2d = 7 + -21

Combine like terms: 21 + -21 = 0
0 + 2d = 7 + -21
2d = 7 + -21

Combine like terms: 7 + -21 = -14
2d = -14

Divide each side by '2'.
d = -7

Simplifying
d = -7

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