Question 628568
{{{ ( 2+x ) / ( 5+x ) = 7/8 }}}
Multiply both sides by {{{ 8*( 5+x ) }}}
{{{ 8*( 2+x ) = 7*( 5+x ) }}}
{{{ 16 + 8x = 35 + 7x }}}
{{{ x = 35 - 16 }}}
{{{ x = 19 }}}
check answer:
{{{ ( 2 + 19 ) / ( 5 + 19 ) = 7/8 }}}
{{{ 21 / 24 = 7/8 }}}
The left side is
{{{ (3/3)*(7/8) = 7/8 }}}
{{{ 1*(7/8) = 7/8 }}}
{{{ 7/8 = 7/8 }}}
OK