-7=d+21

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Solution for -7=d+21 equation:


Simplifying
-7 = d + 21

Reorder the terms:
-7 = 21 + d

Solving
-7 = 21 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
-7 + -1d = 21 + d + -1d

Combine like terms: d + -1d = 0
-7 + -1d = 21 + 0
-7 + -1d = 21

Add '7' to each side of the equation.
-7 + 7 + -1d = 21 + 7

Combine like terms: -7 + 7 = 0
0 + -1d = 21 + 7
-1d = 21 + 7

Combine like terms: 21 + 7 = 28
-1d = 28

Divide each side by '-1'.
d = -28

Simplifying
d = -28

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