100-x=0.4x

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Solution for 100-x=0.4x equation:


Simplifying
100 + -1x = 0.4x

Solving
100 + -1x = 0.4x

Solving for variable 'x'.

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

Add '-0.4x' to each side of the equation.
100 + -1x + -0.4x = 0.4x + -0.4x

Combine like terms: -1x + -0.4x = -1.4x
100 + -1.4x = 0.4x + -0.4x

Combine like terms: 0.4x + -0.4x = 0.0
100 + -1.4x = 0.0

Add '-100' to each side of the equation.
100 + -100 + -1.4x = 0.0 + -100

Combine like terms: 100 + -100 = 0
0 + -1.4x = 0.0 + -100
-1.4x = 0.0 + -100

Combine like terms: 0.0 + -100 = -100
-1.4x = -100

Divide each side by '-1.4'.
x = 71.42857143

Simplifying
x = 71.42857143

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