3d-9=d+7

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Solution for 3d-9=d+7 equation:


Simplifying
3d + -9 = d + 7

Reorder the terms:
-9 + 3d = d + 7

Reorder the terms:
-9 + 3d = 7 + d

Solving
-9 + 3d = 7 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
-9 + 3d + -1d = 7 + d + -1d

Combine like terms: 3d + -1d = 2d
-9 + 2d = 7 + d + -1d

Combine like terms: d + -1d = 0
-9 + 2d = 7 + 0
-9 + 2d = 7

Add '9' to each side of the equation.
-9 + 9 + 2d = 7 + 9

Combine like terms: -9 + 9 = 0
0 + 2d = 7 + 9
2d = 7 + 9

Combine like terms: 7 + 9 = 16
2d = 16

Divide each side by '2'.
d = 8

Simplifying
d = 8

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