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7+3x-12x=3x+7=
We move all terms to the left:
7+3x-12x-(3x+7)=0
We add all the numbers together, and all the variables
-9x-(3x+7)+7=0
We get rid of parentheses
-9x-3x-7+7=0
We add all the numbers together, and all the variables
-12x=0
x=0/-12
x=0
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