x+2x+3x=100-4x

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Solution for x+2x+3x=100-4x equation: 



x+2x+3x=100-4x

We move all terms to the left:

x+2x+3x-(100-4x)=0

We add all the numbers together, and all the variables

x+2x+3x-(-4x+100)=0

We add all the numbers together, and all the variables

6x-(-4x+100)=0

We get rid of parentheses

6x+4x-100=0

We add all the numbers together, and all the variables

10x-100=0

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

10x=100

x=100/10

x=10

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