x+7=12+3x+7x

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



x+7=12+3x+7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(10x+12)+7=0

We get rid of parentheses

x-10x-12+7=0

We add all the numbers together, and all the variables

-9x-5=0

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

-9x=5

x=5/-9

x=-5/9

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