3x+7=5x+15=51-x

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Solution for 3x+7=5x+15=51-x equation: 



3x+7=5x+15=51-x

We move all terms to the left:

3x+7-(5x+15)=0

We get rid of parentheses

3x-5x-15+7=0

We add all the numbers together, and all the variables

-2x-8=0

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

-2x=8

x=8/-2

x=-4

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