20=7+3(d+2)

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Solution for 20=7+3(d+2) equation: 


Simplifying
20 = 7 + 3(d + 2)

Reorder the terms:
20 = 7 + 3(2 + d)
20 = 7 + (2 * 3 + d * 3)
20 = 7 + (6 + 3d)

Combine like terms: 7 + 6 = 13
20 = 13 + 3d

Solving
20 = 13 + 3d

Solving for variable 'd'.

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

Add '-3d' to each side of the equation.
20 + -3d = 13 + 3d + -3d

Combine like terms: 3d + -3d = 0
20 + -3d = 13 + 0
20 + -3d = 13

Add '-20' to each side of the equation.
20 + -20 + -3d = 13 + -20

Combine like terms: 20 + -20 = 0
0 + -3d = 13 + -20
-3d = 13 + -20

Combine like terms: 13 + -20 = -7
-3d = -7

Divide each side by '-3'.
d = 2.333333333

Simplifying
d = 2.333333333

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