2(d+3)+2d=18

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Solution for 2(d+3)+2d=18 equation:


Simplifying
2(d + 3) + 2d = 18

Reorder the terms:
2(3 + d) + 2d = 18
(3 * 2 + d * 2) + 2d = 18
(6 + 2d) + 2d = 18

Combine like terms: 2d + 2d = 4d
6 + 4d = 18

Solving
6 + 4d = 18

Solving for variable 'd'.

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

Add '-6' to each side of the equation.
6 + -6 + 4d = 18 + -6

Combine like terms: 6 + -6 = 0
0 + 4d = 18 + -6
4d = 18 + -6

Combine like terms: 18 + -6 = 12
4d = 12

Divide each side by '4'.
d = 3

Simplifying
d = 3

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