8-7d+9d=12

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Solution for 8-7d+9d=12 equation: 


Simplifying
8 + -7d + 9d = 12

Combine like terms: -7d + 9d = 2d
8 + 2d = 12

Solving
8 + 2d = 12

Solving for variable 'd'.

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

Add '-8' to each side of the equation.
8 + -8 + 2d = 12 + -8

Combine like terms: 8 + -8 = 0
0 + 2d = 12 + -8
2d = 12 + -8

Combine like terms: 12 + -8 = 4
2d = 4

Divide each side by '2'.
d = 2

Simplifying
d = 2

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