Question 1177656
{{{T = 7000 (w / d^2)(1 / v - 1 / u)}}}



{{{ Td^2/7000 w= (1/v  -1/u)}}}


{{{ Td^2/7000 w +  1/u  =    1/v }}} 


{{{( uTd^2 +7000w)/7000wu   = 1/v}}}


{{{ 7000wu / ( uTd^2 +7000w) =v }}}