8d+3-9d=21

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Solution for 8d+3-9d=21 equation:


Simplifying
8d + 3 + -9d = 21

Reorder the terms:
3 + 8d + -9d = 21

Combine like terms: 8d + -9d = -1d
3 + -1d = 21

Solving
3 + -1d = 21

Solving for variable 'd'.

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

Add '-3' to each side of the equation.
3 + -3 + -1d = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -1d = 21 + -3
-1d = 21 + -3

Combine like terms: 21 + -3 = 18
-1d = 18

Divide each side by '-1'.
d = -18

Simplifying
d = -18

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