4=0.4x

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Solution for 4=0.4x equation:


Simplifying
4 = 0.4x

Solving
4 = 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.
4 + -0.4x = 0.4x + -0.4x

Combine like terms: 0.4x + -0.4x = 0.0
4 + -0.4x = 0.0

Add '-4' to each side of the equation.
4 + -4 + -0.4x = 0.0 + -4

Combine like terms: 4 + -4 = 0
0 + -0.4x = 0.0 + -4
-0.4x = 0.0 + -4

Combine like terms: 0.0 + -4 = -4
-0.4x = -4

Divide each side by '-0.4'.
x = 10

Simplifying
x = 10

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