x+3x=8400

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Solution for x+3x=8400 equation: 


Simplifying
x + 3x = 8400

Combine like terms: x + 3x = 4x
4x = 8400

Solving
4x = 8400

Solving for variable 'x'.

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

Divide each side by '4'.
x = 2100

Simplifying
x = 2100

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