4x+6=7x+15=120

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Solution for 4x+6=7x+15=120 equation: 



4x+6=7x+15=120

We move all terms to the left:

4x+6-(7x+15)=0

We get rid of parentheses

4x-7x-15+6=0

We add all the numbers together, and all the variables

-3x-9=0

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

-3x=9

x=9/-3

x=-3

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