3x-4x+5x=30

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Solution for 3x-4x+5x=30 equation: 



3x-4x+5x=30

We move all terms to the left:

3x-4x+5x-(30)=0

We add all the numbers together, and all the variables

4x-30=0

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

4x=30

x=30/4

x=7+1/2

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