4x+3x-x=30

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Solution for 4x+3x-x=30 equation: 



4x+3x-x=30

We move all terms to the left:

4x+3x-x-(30)=0

We add all the numbers together, and all the variables

6x-30=0

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

6x=30

x=30/6

x=5

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