Question 942789
{{{ 21y + 7 = 10 }}}
Subtract {{{ 7 }}} from both sides
{{{ 21y + 7 - 7 = 10 - 7 }}}
{{{ 21y = 3 }}}
Divide both sides by {{{ 21 }}}
{{{ ( 21/21)*y = 3/21 }}}
{{{ y = 3/21 }}}
Divide top and bottom of the right side by {{{ 3 }}}
{{{ y = 1/7 }}}