400=x-(x*0.2)

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Solution for 400=x-(x*0.2) equation:


Simplifying
400 = x + -1(x * 0.2)

Reorder the terms for easier multiplication:
400 = x + -1(0.2x)

Remove parenthesis around (0.2x)
400 = x + -1 * 0.2x

Multiply -1 * 0.2
400 = x + -0.2x

Combine like terms: x + -0.2x = 0.8x
400 = 0.8x

Solving
400 = 0.8x

Solving for variable 'x'.

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

Add '-0.8x' to each side of the equation.
400 + -0.8x = 0.8x + -0.8x

Combine like terms: 0.8x + -0.8x = 0.0
400 + -0.8x = 0.0

Add '-400' to each side of the equation.
400 + -400 + -0.8x = 0.0 + -400

Combine like terms: 400 + -400 = 0
0 + -0.8x = 0.0 + -400
-0.8x = 0.0 + -400

Combine like terms: 0.0 + -400 = -400
-0.8x = -400

Divide each side by '-0.8'.
x = 500

Simplifying
x = 500

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