a+a+d+a+2d=9

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Solution for a+a+d+a+2d=9 equation:


Simplifying
a + a + d + a + 2d = 9

Reorder the terms:
a + a + a + d + 2d = 9

Combine like terms: a + a = 2a
2a + a + d + 2d = 9

Combine like terms: 2a + a = 3a
3a + d + 2d = 9

Combine like terms: d + 2d = 3d
3a + 3d = 9

Solving
3a + 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.
3a + 3d + -3d = 9 + -3d

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

Divide each side by '3'.
a = 3 + -1d

Simplifying
a = 3 + -1d

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