-d+-9d+4d+8d=12

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Solution for -d+-9d+4d+8d=12 equation: 


Simplifying
-1d + -9d + 4d + 8d = 12

Combine like terms: -1d + -9d = -10d
-10d + 4d + 8d = 12

Combine like terms: -10d + 4d = -6d
-6d + 8d = 12

Combine like terms: -6d + 8d = 2d
2d = 12

Solving
2d = 12

Solving for variable 'd'.

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

Divide each side by '2'.
d = 6

Simplifying
d = 6

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