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x+4-3x=4x+12x
We move all terms to the left:
x+4-3x-(4x+12x)=0
We add all the numbers together, and all the variables
x-3x-(+16x)+4=0
We add all the numbers together, and all the variables
-2x-(+16x)+4=0
We get rid of parentheses
-2x-16x+4=0
We add all the numbers together, and all the variables
-18x+4=0
We move all terms containing x to the left, all other terms to the right
-18x=-4
x=-4/-18
x=2/9
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