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4b=3b+21
We simplify the equation to the form, which is simple to understand
4b=3b+21
We move all terms containing b to the left and all other terms to the right.
+4b-3b=+21
We simplify left and right side of the equation.
+1b=+21
We divide both sides of the equation by 1 to get b.
b=21
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