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7x+12=4x+40
We move all terms to the left:
7x+12-(4x+40)=0
We get rid of parentheses
7x-4x-40+12=0
We add all the numbers together, and all the variables
3x-28=0
We move all terms containing x to the left, all other terms to the right
3x=28
x=28/3
x=9+1/3
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