7x-120-4x=30

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Solution for 7x-120-4x=30 equation: 



7x-120-4x=30

We move all terms to the left:

7x-120-4x-(30)=0

We add all the numbers together, and all the variables

3x-150=0

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

3x=150

x=150/3

x=50

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