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10-x+10-x+x+x=220
We simplify the equation to the form, which is simple to understand
10-x+10-x+x+x=220
We move all terms containing x to the left and all other terms to the right.
-1x-1x+1x+1x=+220-10-10
We simplify left and right side of the equation.
0x=+200
0=200
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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