3(d-1)=12

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Solution for 3(d-1)=12 equation: 


Simplifying
3(d + -1) = 12

Reorder the terms:
3(-1 + d) = 12
(-1 * 3 + d * 3) = 12
(-3 + 3d) = 12

Solving
-3 + 3d = 12

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 + 3d = 12 + 3

Combine like terms: -3 + 3 = 0
0 + 3d = 12 + 3
3d = 12 + 3

Combine like terms: 12 + 3 = 15
3d = 15

Divide each side by '3'.
d = 5

Simplifying
d = 5

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