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7-b-2b=0
We simplify the equation to the form, which is simple to understand
7-b-2b=0
We move all terms containing b to the left and all other terms to the right.
-1b-2b=0-7
We simplify left and right side of the equation.
-3b=-7
We divide both sides of the equation by -3 to get b.
b=2.3333333333333
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