x-3=7+8x

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Solution for x-3=7+8x equation: 



x-3=7+8x

We move all terms to the left:

x-3-(7+8x)=0

We add all the numbers together, and all the variables

x-(8x+7)-3=0

We get rid of parentheses

x-8x-7-3=0

We add all the numbers together, and all the variables

-7x-10=0

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

-7x=10

x=10/-7

x=-1+3/7

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