7x-90=4x+30

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Solution for 7x-90=4x+30 equation: 



7x-90=4x+30

We move all terms to the left:

7x-90-(4x+30)=0

We get rid of parentheses

7x-4x-30-90=0

We add all the numbers together, and all the variables

3x-120=0

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

3x=120

x=120/3

x=40

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