100x+300x=8400

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Solution for 100x+300x=8400 equation: 


Simplifying
100x + 300x = 8400

Combine like terms: 100x + 300x = 400x
400x = 8400

Solving
400x = 8400

Solving for variable 'x'.

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

Divide each side by '400'.
x = 21

Simplifying
x = 21

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