4a-400=x

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Solution for 4a-400=x equation:


Simplifying
4a + -400 = x

Reorder the terms:
-400 + 4a = x

Solving
-400 + 4a = x

Solving for variable 'a'.

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

Add '400' to each side of the equation.
-400 + 400 + 4a = 400 + x

Combine like terms: -400 + 400 = 0
0 + 4a = 400 + x
4a = 400 + x

Divide each side by '4'.
a = 100 + 0.25x

Simplifying
a = 100 + 0.25x

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