2*2*2+d=21

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Solution for 2*2*2+d=21 equation: 


Simplifying
2 * 2 * 2 + d = 21

Multiply 2 * 2
4 * 2 + d = 21

Multiply 4 * 2
8 + d = 21

Solving
8 + d = 21

Solving for variable 'd'.

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

Add '-8' to each side of the equation.
8 + -8 + d = 21 + -8

Combine like terms: 8 + -8 = 0
0 + d = 21 + -8
d = 21 + -8

Combine like terms: 21 + -8 = 13
d = 13

Simplifying
d = 13

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