2[a-10]=4

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Solution for 2[a-10]=4 equation: 


Simplifying
2[a + -10] = 4

Reorder the terms:
2[-10 + a] = 4
[-10 * 2 + a * 2] = 4
[-20 + 2a] = 4

Solving
-20 + 2a = 4

Solving for variable 'a'.

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

Add '20' to each side of the equation.
-20 + 20 + 2a = 4 + 20

Combine like terms: -20 + 20 = 0
0 + 2a = 4 + 20
2a = 4 + 20

Combine like terms: 4 + 20 = 24
2a = 24

Divide each side by '2'.
a = 12

Simplifying
a = 12

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