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x-12=0.7x

We move all terms to the left:

x-12-(0.7x)=0

We add all the numbers together, and all the variables

x-(+0.7x)-12=0

We get rid of parentheses

x-0.7x-12=0

We add all the numbers together, and all the variables

0.3x-12=0

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

0.3x=12

x=12/0.3

x=40

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