Question 1137720
Let {{{ x }}} = her grandmother's age now
{{{ x - 56 }}} = Sonya's age now
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{{{ x - 5 = 8*( x - 56 - 5 ) }}}
{{{ x - 5 = 8x - 488 }}}
{{{ 7x = 483 }}}
{{{ x = 69 }}}
and
{{{ x - 56 = 13 }}}
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Grandmother is 69
Sonya is 13