Question 762822
Let the number  = {{{ n }}}
given:
{{{ ( 2/5 )*n = ( 1/7 )*n + 36 }}}
Subtract {{{ ( 1/7 )*n }}} from both sides
{{{ ( 2/5 )*n - ( 1/7 )*n = 36 }}}
Multiply both sides by {{{ 35 }}}
{{{ 35*( 2/5 )*n - 35*( 1/7 )*n = 35*36 }}}
{{{ 14n - 5n = 1260 }}}
{{{ 9n = 1260 }}}
{{{ n = 140 }}}
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check answer:
{{{ 2/5 = .4 }}}
{{{ 1/7 = .14286 }}}
{{{ ( 2/5 )*n = ( 1/7 )*n + 36 }}}
{{{ .4*140  = .14286*140 + 36 }}}
{{{ 56 = 20.0004 + 36 }}}
{{{ 56 = 56.0004 }}}
OK -error due to rounding off