x-1+7=12+3x

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Solution for x-1+7=12+3x equation: 



x-1+7=12+3x

We move all terms to the left:

x-1+7-(12+3x)=0

We add all the numbers together, and all the variables

x-(3x+12)-1+7=0

We add all the numbers together, and all the variables

x-(3x+12)+6=0

We get rid of parentheses

x-3x-12+6=0

We add all the numbers together, and all the variables

-2x-6=0

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

-2x=6

x=6/-2

x=-3

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