5d+7=7d-21

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


Simplifying
5d + 7 = 7d + -21

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

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

Solving
7 + 5d = -21 + 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.
7 + 5d + -7d = -21 + 7d + -7d

Combine like terms: 5d + -7d = -2d
7 + -2d = -21 + 7d + -7d

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

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

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

Combine like terms: -21 + -7 = -28
-2d = -28

Divide each side by '-2'.
d = 14

Simplifying
d = 14

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