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b-9+3b=28
We simplify the equation to the form, which is simple to understand
b-9+3b=28
We move all terms containing b to the left and all other terms to the right.
+1b+3b=+28+9
We simplify left and right side of the equation.
+4b=+37
We divide both sides of the equation by 4 to get b.
b=9.25
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