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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

5x+100=0

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

5x=-100

x=-100/5

x=-20

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