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2=9+b/13
We simplify the equation to the form, which is simple to understand
2=9+b/13
We move all terms containing b to the left and all other terms to the right.
-0.076923076923077b=+9-2
We simplify left and right side of the equation.
-0.076923076923077b=+7
We divide both sides of the equation by -00.076923076923077 to get b.
b=-91
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