11d+9=7d-21

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Solution for 11d+9=7d-21 equation:


Simplifying
11d + 9 = 7d + -21

Reorder the terms:
9 + 11d = 7d + -21

Reorder the terms:
9 + 11d = -21 + 7d

Solving
9 + 11d = -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.
9 + 11d + -7d = -21 + 7d + -7d

Combine like terms: 11d + -7d = 4d
9 + 4d = -21 + 7d + -7d

Combine like terms: 7d + -7d = 0
9 + 4d = -21 + 0
9 + 4d = -21

Add '-9' to each side of the equation.
9 + -9 + 4d = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 4d = -21 + -9
4d = -21 + -9

Combine like terms: -21 + -9 = -30
4d = -30

Divide each side by '4'.
d = -7.5

Simplifying
d = -7.5

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