x=100-3x

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Solution for x=100-3x equation: 


Simplifying
x = 100 + -3x

Solving
x = 100 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
x + 3x = 100 + -3x + 3x

Combine like terms: x + 3x = 4x
4x = 100 + -3x + 3x

Combine like terms: -3x + 3x = 0
4x = 100 + 0
4x = 100

Divide each side by '4'.
x = 25

Simplifying
x = 25

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