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13=(2/0)-9+b
We simplify the equation to the form, which is simple to understand
13=(2/0)-9+b
Remove unnecessary parentheses
13=2/0-9+b
We move all terms containing b to the left and all other terms to the right.
-1b=+2-9-13
We simplify left and right side of the equation.
-1b=-20
We divide both sides of the equation by -01 to get b.
b=20
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