6d+6d+9d-9=180

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Solution for 6d+6d+9d-9=180 equation: 


Simplifying
6d + 6d + 9d + -9 = 180

Reorder the terms:
-9 + 6d + 6d + 9d = 180

Combine like terms: 6d + 6d = 12d
-9 + 12d + 9d = 180

Combine like terms: 12d + 9d = 21d
-9 + 21d = 180

Solving
-9 + 21d = 180

Solving for variable 'd'.

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

Add '9' to each side of the equation.
-9 + 9 + 21d = 180 + 9

Combine like terms: -9 + 9 = 0
0 + 21d = 180 + 9
21d = 180 + 9

Combine like terms: 180 + 9 = 189
21d = 189

Divide each side by '21'.
d = 9

Simplifying
d = 9

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