Question 1027391
{{{R(1-4(3R+2))=7}}}
{{{R(1-12R-8)=7}}}
{{{R(-7-12R)=7}}}
{{{-7R-12R^2=7}}}
{{{12R^2+7R+7=0}}}
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{{{R= (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{R = (-7 +- sqrt( 7^2-4*12*7 ))/(2*12) }}} 
{{{R = (-7 +- sqrt( 49-336 ))/(24) }}} 
{{{R = (-7 +- sqrt( -287 ))/(24) }}}
{{{highlight(R = (-7 +- i*sqrt( 287 ))/(24) )}}}