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-1-\left(3+x\right)=x-4
Variable x cannot be equal to 4 since division by zero is not defined. Multiply both sides of the equation by x-4, the least common multiple of 4-x,x-4.
-1-3-x=x-4
To find the opposite of 3+x, find the opposite of each term.
-4-x=x-4
Subtract 3 from -1 to get -4.
-4-x-x=-4
Subtract x from both sides.
-4-2x=-4
Combine -x and -x to get -2x.
-2x=-4+4
Add 4 to both sides.
-2x=0
Add -4 and 4 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.