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39=-3(23-b)+3(b-2)
We simplify the equation to the form, which is simple to understand
39=-3(23-b)+3(b-2)
Reorder the terms in parentheses
39=+(-69+3b)+3*(b-2)
Remove unnecessary parentheses
+39=-69+3b+3+*(+b-2+)
Reorder the terms in parentheses
39=-69+3b+(+3b-6)
Remove unnecessary parentheses
+39=-69+3b+3b-6
We move all terms containing b to the left and all other terms to the right.
-3b-3b=-69-6-39
We simplify left and right side of the equation.
-6b=-114
We divide both sides of the equation by -6 to get b.
b=19
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