9x-78=42+3x

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Solution for 9x-78=42+3x equation: 



9x-78=42+3x

We move all terms to the left:

9x-78-(42+3x)=0

We add all the numbers together, and all the variables

9x-(3x+42)-78=0

We get rid of parentheses

9x-3x-42-78=0

We add all the numbers together, and all the variables

6x-120=0

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

6x=120

x=120/6

x=20

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