.25(12+d)=13

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Solution for .25(12+d)=13 equation: 


Simplifying
0.25(12 + d) = 13
(12 * 0.25 + d * 0.25) = 13
(3 + 0.25d) = 13

Solving
3 + 0.25d = 13

Solving for variable 'd'.

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

Add '-3' to each side of the equation.
3 + -3 + 0.25d = 13 + -3

Combine like terms: 3 + -3 = 0
0 + 0.25d = 13 + -3
0.25d = 13 + -3

Combine like terms: 13 + -3 = 10
0.25d = 10

Divide each side by '0.25'.
d = 40

Simplifying
d = 40

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