2(a-1)=9

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Solution for 2(a-1)=9 equation: 


Simplifying
2(a + -1) = 9

Reorder the terms:
2(-1 + a) = 9
(-1 * 2 + a * 2) = 9
(-2 + 2a) = 9

Solving
-2 + 2a = 9

Solving for variable 'a'.

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

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

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

Combine like terms: 9 + 2 = 11
2a = 11

Divide each side by '2'.
a = 5.5

Simplifying
a = 5.5

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