Question 1156868
{{{(0.40u+3)/(u+3)=0.58}}}


{{{0.4u+3=0.58u+0.58*3}}}

{{{3-0.58*3=0.58u-0.4u}}}

{{{3*0.42=0.18u}}}

{{{u=3*0.42/0.18}}}

{{{highlight(u=7)}}}