2d+9=8

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Solution for 2d+9=8 equation: 


Simplifying
2d + 9 = 8

Reorder the terms:
9 + 2d = 8

Solving
9 + 2d = 8

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 + 2d = 8 + -9

Combine like terms: 9 + -9 = 0
0 + 2d = 8 + -9
2d = 8 + -9

Combine like terms: 8 + -9 = -1
2d = -1

Divide each side by '2'.
d = -0.5

Simplifying
d = -0.5

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