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x+12=7x+30
We move all terms to the left:
x+12-(7x+30)=0
We get rid of parentheses
x-7x-30+12=0
We add all the numbers together, and all the variables
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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