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3-4x=4+12x
We move all terms to the left:
3-4x-(4+12x)=0
We add all the numbers together, and all the variables
-4x-(12x+4)+3=0
We get rid of parentheses
-4x-12x-4+3=0
We add all the numbers together, and all the variables
-16x-1=0
We move all terms containing x to the left, all other terms to the right
-16x=1
x=1/-16
x=-1/16
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