3x+x=400

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Solution for 3x+x=400 equation:


3x+x=400

We simplify the equation to the form, which is simple to understand 
3x+x=400

We move all terms containing x to the left and all other terms to the right. 
+3x+1x=+400

We simplify left and right side of the equation. 
+4x=+400

We divide both sides of the equation by 4 to get x. 
x=100

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