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-4b=2(-2b)
We simplify the equation to the form, which is simple to understand
-4b=2(-2b)
Reorder the terms in parentheses
-4b=+(-4b)
Remove unnecessary parentheses
-4b=-4b
We move all terms containing b to the left and all other terms to the right.
-4b+4b=0
We simplify left and right side of the equation.
b=0
0=0
This equation is an identity, so all real numbers are solutions.
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