5x+15=8x+42

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Solution for 5x+15=8x+42 equation: 



5x+15=8x+42

We move all terms to the left:

5x+15-(8x+42)=0

We get rid of parentheses

5x-8x-42+15=0

We add all the numbers together, and all the variables

-3x-27=0

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

-3x=27

x=27/-3

x=-9

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