3(7d+7)=

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Solution for 3(7d+7)= equation: 


Simplifying
3(7d + 7) = 0

Reorder the terms:
3(7 + 7d) = 0
(7 * 3 + 7d * 3) = 0
(21 + 21d) = 0

Solving
21 + 21d = 0

Solving for variable 'd'.

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

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

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

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

Divide each side by '21'.
d = -1

Simplifying
d = -1

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