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-21+x=x+20
We simplify the equation to the form, which is simple to understand
-21+x=x+20
We move all terms containing x to the left and all other terms to the right.
+1x-1x=+20+21
We simplify left and right side of the equation.
0x=+41
0=41
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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