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20-x+x=125
We simplify the equation to the form, which is simple to understand
20-x+x=125
We move all terms containing x to the left and all other terms to the right.
-1x+1x=+125-20
We simplify left and right side of the equation.
0x=+105
0=105
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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