4*100+3x=400

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Solution for 4*100+3x=400 equation: 


Simplifying
4 * 100 + 3x = 400

Multiply 4 * 100
400 + 3x = 400

Add '-400' to each side of the equation.
400 + -400 + 3x = 400 + -400

Combine like terms: 400 + -400 = 0
0 + 3x = 400 + -400
3x = 400 + -400

Combine like terms: 400 + -400 = 0
3x = 0

Solving
3x = 0

Solving for variable 'x'.

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

Divide each side by '3'.
x = 0

Simplifying
x = 0

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