.90=(1-1a)

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Solution for .90=(1-1a) equation:


Simplifying
0.90 = (1 + -1a)

Remove parenthesis around (1 + -1a)
0.90 = 1 + -1a

Solving
0.90 = 1 + -1a

Solving for variable 'a'.

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

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

Combine like terms: -1a + a = 0
0.90 + a = 1 + 0
0.90 + a = 1

Add '-0.90' to each side of the equation.
0.90 + -0.90 + a = 1 + -0.90

Combine like terms: 0.90 + -0.90 = 0.00
0.00 + a = 1 + -0.90
a = 1 + -0.90

Combine like terms: 1 + -0.90 = 0.1
a = 0.1

Simplifying
a = 0.1

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