Question 885612
{{{b-y(y4-b)-7}}}
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y=2  and  b=7
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{{{7-2(2*4-7)-7}}}
{{{7-2(8-7)-7}}}
{{{7-2(1)-7}}}
{{{7-2-7}}}
{{{highlight(-2)}}}


Did you copy the expression incorrectly?