2a-9=-1

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Solution for 2a-9=-1 equation: 


Simplifying
2a + -9 = -1

Reorder the terms:
-9 + 2a = -1

Solving
-9 + 2a = -1

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 2a = -1 + 9

Combine like terms: -9 + 9 = 0
0 + 2a = -1 + 9
2a = -1 + 9

Combine like terms: -1 + 9 = 8
2a = 8

Divide each side by '2'.
a = 4

Simplifying
a = 4

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