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3x+12=5x+0
We move all terms to the left:
3x+12-(5x+0)=0
We add all the numbers together, and all the variables
3x-(+5x)+12=0
We get rid of parentheses
3x-5x+12=0
We add all the numbers together, and all the variables
-2x+12=0
We move all terms containing x to the left, all other terms to the right
-2x=-12
x=-12/-2
x=+6
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