a-.4a=42

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Solution for a-.4a=42 equation: 


Simplifying
a + -0.4a = 42

Combine like terms: a + -0.4a = 0.6a
0.6a = 42

Solving
0.6a = 42

Solving for variable 'a'.

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

Divide each side by '0.6'.
a = 70

Simplifying
a = 70

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