-6+d+2d=9

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Solution for -6+d+2d=9 equation: 


Simplifying
-6 + d + 2d = 9

Combine like terms: d + 2d = 3d
-6 + 3d = 9

Solving
-6 + 3d = 9

Solving for variable 'd'.

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

Add '6' to each side of the equation.
-6 + 6 + 3d = 9 + 6

Combine like terms: -6 + 6 = 0
0 + 3d = 9 + 6
3d = 9 + 6

Combine like terms: 9 + 6 = 15
3d = 15

Divide each side by '3'.
d = 5

Simplifying
d = 5

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