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(4-x)+x=0
We simplify the equation to the form, which is simple to understand
(4-x)+x=0
Remove unnecessary parentheses
4-x+x=0
We move all terms containing x to the left and all other terms to the right.
-1x+1x=0-4
We simplify left and right side of the equation.
0x=-4
0=-4
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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