Question 377992
{{{(z^2+2z-3)/(z^2+10z+21)=((z+3)(z-1))/((z+3)(z+7))}}}
{{{(z^2+2z-3)/(z^2+10z+21)= (z-1)/(z+7)}}}
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{{{(2z^2-18)/(z^2+14z+49)=(2(z-3)(z+3))/(z+7)^2}}}
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{{{((z^2+2z-3)/(z^2+10z+21))/((2z^2-18)/(z^2+14z+49))= ((z-1)/(z+7))*((z+7)^2/(2(z-3)(z+3)))}}}
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{{{((z^2+2z-3)/(z^2+10z+21))/((2z^2-18)/(z^2+14z+49))= highlight(((z-1)(z+7))/(2(z-3)(z+3))))}}}