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