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