d-3a=b

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Solution for d-3a=b equation: 


Simplifying
d + -3a = b

Reorder the terms:
-3a + d = b

Solving
-3a + d = b

Solving for variable 'a'.

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

Add '-1d' to each side of the equation.
-3a + d + -1d = b + -1d

Combine like terms: d + -1d = 0
-3a + 0 = b + -1d
-3a = b + -1d

Divide each side by '-3'.
a = -0.3333333333b + 0.3333333333d

Simplifying
a = -0.3333333333b + 0.3333333333d

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