100-x=3x

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Solution for 100-x=3x equation:


Simplifying
100 + -1x = 3x

Solving
100 + -1x = 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.
100 + -1x + -3x = 3x + -3x

Combine like terms: -1x + -3x = -4x
100 + -4x = 3x + -3x

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

Add '-100' to each side of the equation.
100 + -100 + -4x = 0 + -100

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

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

Divide each side by '-4'.
x = 25

Simplifying
x = 25

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