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2b-4=2b
We simplify the equation to the form, which is simple to understand
2b-4=2b
We move all terms containing b to the left and all other terms to the right.
+2b-2b=+4
We simplify left and right side of the equation.
b=+4
0=04
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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