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21-7b=5(8b-6)+4b
We simplify the equation to the form, which is simple to understand
21-7b=5(8b-6)+4b
Reorder the terms in parentheses
21-7b=+(+40b-30)+4b
Remove unnecessary parentheses
+21-7b=+40b-30+4b
We move all terms containing b to the left and all other terms to the right.
-7b-40b-4b=-30-21
We simplify left and right side of the equation.
-51b=-51
We divide both sides of the equation by -51 to get b.
b=1
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