-4d-7=-21

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Solution for -4d-7=-21 equation: 


Simplifying
-4d + -7 = -21

Reorder the terms:
-7 + -4d = -21

Solving
-7 + -4d = -21

Solving for variable 'd'.

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

Add '7' to each side of the equation.
-7 + 7 + -4d = -21 + 7

Combine like terms: -7 + 7 = 0
0 + -4d = -21 + 7
-4d = -21 + 7

Combine like terms: -21 + 7 = -14
-4d = -14

Divide each side by '-4'.
d = 3.5

Simplifying
d = 3.5

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