-21=-3d-4d

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Solution for -21=-3d-4d equation:


Simplifying
-21 = -3d + -4d

Combine like terms: -3d + -4d = -7d
-21 = -7d

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

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

Add '21' to each side of the equation.
-21 + 21 + 7d = 0 + 21

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

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

Divide each side by '7'.
d = 3

Simplifying
d = 3

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