d+3=2(9+d)

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Solution for d+3=2(9+d) equation:


Simplifying
d + 3 = 2(9 + d)

Reorder the terms:
3 + d = 2(9 + d)
3 + d = (9 * 2 + d * 2)
3 + d = (18 + 2d)

Solving
3 + d = 18 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
3 + d + -2d = 18 + 2d + -2d

Combine like terms: d + -2d = -1d
3 + -1d = 18 + 2d + -2d

Combine like terms: 2d + -2d = 0
3 + -1d = 18 + 0
3 + -1d = 18

Add '-3' to each side of the equation.
3 + -3 + -1d = 18 + -3

Combine like terms: 3 + -3 = 0
0 + -1d = 18 + -3
-1d = 18 + -3

Combine like terms: 18 + -3 = 15
-1d = 15

Divide each side by '-1'.
d = -15

Simplifying
d = -15

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