Question 672363
{{{((b+4)^2)/(b^2+7b+12)}}}
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{{{((b+4)(b+4))/((b+3)(b+4))}}}
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{{{(cross(b+4)(b+4))/((b+3)cross(b+4))}}}
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{{{highlight_green((b+4)/(b+3))}}}
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