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x+12=9+5x
We move all terms to the left:
x+12-(9+5x)=0
We add all the numbers together, and all the variables
x-(5x+9)+12=0
We get rid of parentheses
x-5x-9+12=0
We add all the numbers together, and all the variables
-4x+3=0
We move all terms containing x to the left, all other terms to the right
-4x=-3
x=-3/-4
x=3/4
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