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x-3=1+x+x
We move all terms to the left:
x-3-(1+x+x)=0
We add all the numbers together, and all the variables
x-(2x+1)-3=0
We get rid of parentheses
x-2x-1-3=0
We add all the numbers together, and all the variables
-1x-4=0
We move all terms containing x to the left, all other terms to the right
-x=4
x=4/-1
x=-4
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