(a-2a)=b

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Solution for (a-2a)=b equation: 


Simplifying
(a + -2a) = b

Combine like terms: a + -2a = -1a
(-1a) = b
(-1a) = b

Solving
(-1a) = b

Solving for variable 'a'.

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

Divide each side by '-1'.
a = -1b

Simplifying
a = -1b

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