6+0.5d=21

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Solution for 6+0.5d=21 equation: 


Simplifying
6 + 0.5d = 21

Solving
6 + 0.5d = 21

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 + 0.5d = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 0.5d = 21 + -6
0.5d = 21 + -6

Combine like terms: 21 + -6 = 15
0.5d = 15

Divide each side by '0.5'.
d = 30

Simplifying
d = 30

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