Long description
B over a x + 1 over a x minus start fraction 2 b minus 1 over a x end fraction = start fraction b + 1 minus left parenthesis 2 b minus 1 right parenthesis over a x end fraction = start parenthesis b + 1 minus 2 b + 1 over a x end fraction, the parentheses are used to show subtraction of both terms. start fraction 2 minus b over a x end fraction.
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