a+3d=9

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Solution for a+3d=9 equation: 


Simplifying
a + 3d = 9

Solving
a + 3d = 9

Solving for variable 'a'.

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

Add '-3d' to each side of the equation.
a + 3d + -3d = 9 + -3d

Combine like terms: 3d + -3d = 0
a + 0 = 9 + -3d
a = 9 + -3d

Simplifying
a = 9 + -3d

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