=639[2-a]

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Solution for =639[2-a] equation: 


Simplifying
0 = 639[2 + -1a]
0 = [2 * 639 + -1a * 639]
0 = [1278 + -639a]

Solving
0 = 1278 + -639a

Solving for variable 'a'.

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

Add '639a' to each side of the equation.
0 + 639a = 1278 + -639a + 639a
Remove the zero:
639a = 1278 + -639a + 639a

Combine like terms: -639a + 639a = 0
639a = 1278 + 0
639a = 1278

Divide each side by '639'.
a = 2

Simplifying
a = 2

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