2(a-1)=4

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Solution for 2(a-1)=4 equation: 


Simplifying
2(a + -1) = 4

Reorder the terms:
2(-1 + a) = 4
(-1 * 2 + a * 2) = 4
(-2 + 2a) = 4

Solving
-2 + 2a = 4

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 = 4 + 2

Combine like terms: -2 + 2 = 0
0 + 2a = 4 + 2
2a = 4 + 2

Combine like terms: 4 + 2 = 6
2a = 6

Divide each side by '2'.
a = 3

Simplifying
a = 3

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