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-21=4b+19--6b
We simplify the equation to the form, which is simple to understand
-21=4b+19+6b
We move all terms containing b to the left and all other terms to the right.
-4b-6b=+19+21
We simplify left and right side of the equation.
-10b=+40
We divide both sides of the equation by -10 to get b.
b=-4
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