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6b+3b-4b=20
We simplify the equation to the form, which is simple to understand
6b+3b-4b=20
We move all terms containing b to the left and all other terms to the right.
+6b+3b-4b=+20
We simplify left and right side of the equation.
+5b=+20
We divide both sides of the equation by 5 to get b.
b=4
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