3-a=4d+12

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Solution for 3-a=4d+12 equation:


Simplifying
3 + -1a = 4d + 12

Reorder the terms:
3 + -1a = 12 + 4d

Solving
3 + -1a = 12 + 4d

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + -1a = 12 + -3 + 4d

Combine like terms: 3 + -3 = 0
0 + -1a = 12 + -3 + 4d
-1a = 12 + -3 + 4d

Combine like terms: 12 + -3 = 9
-1a = 9 + 4d

Divide each side by '-1'.
a = -9 + -4d

Simplifying
a = -9 + -4d

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