400=x+240

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Solution for 400=x+240 equation: 



400=x+240

We move all terms to the left:

400-(x+240)=0

We get rid of parentheses

-x-240+400=0

We add all the numbers together, and all the variables

-1x+160=0

We move all terms containing x to the left, all other terms to the right

-x=-160

x=-160/-1

x=+160

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