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-x+3=-x-4
We simplify the equation to the form, which is simple to understand
-x+3=-x-4
We move all terms containing x to the left and all other terms to the right.
-1x+1x=-4-3
We simplify left and right side of the equation.
0x=-7
0=-7
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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