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x+1-3x=1
Subtract 3x from both sides.
-2x+1=1
Combine x and -3x to get -2x.
-2x=1-1
Subtract 1 from both sides.
-2x=0
Subtract 1 from 1 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -2 is not equal to 0, x must be equal to 0.