3+d=9-d

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Solution for 3+d=9-d equation:


Simplifying
3 + d = 9 + -1d

Solving
3 + d = 9 + -1d

Solving for variable 'd'.

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

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

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

Combine like terms: -1d + d = 0
3 + 2d = 9 + 0
3 + 2d = 9

Add '-3' to each side of the equation.
3 + -3 + 2d = 9 + -3

Combine like terms: 3 + -3 = 0
0 + 2d = 9 + -3
2d = 9 + -3

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

Divide each side by '2'.
d = 3

Simplifying
d = 3

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