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12-3x=4x+5
We move all terms to the left:
12-3x-(4x+5)=0
We get rid of parentheses
-3x-4x-5+12=0
We add all the numbers together, and all the variables
-7x+7=0
We move all terms containing x to the left, all other terms to the right
-7x=-7
x=-7/-7
x=1
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