9=4-9a

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Solution for 9=4-9a equation:


Simplifying
9 = 4 + -9a

Solving
9 = 4 + -9a

Solving for variable 'a'.

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

Add '9a' to each side of the equation.
9 + 9a = 4 + -9a + 9a

Combine like terms: -9a + 9a = 0
9 + 9a = 4 + 0
9 + 9a = 4

Add '-9' to each side of the equation.
9 + -9 + 9a = 4 + -9

Combine like terms: 9 + -9 = 0
0 + 9a = 4 + -9
9a = 4 + -9

Combine like terms: 4 + -9 = -5
9a = -5

Divide each side by '9'.
a = -0.5555555556

Simplifying
a = -0.5555555556

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