Question 737171
Let the number be {{{ n }}}
{{{ 7n = -20n - 9 }}}
Add {{{ 20n }}} to both sides
{{{ 27n = -9 }}}
{{{ n = - 1/3 }}}
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check:
{{{ 7n = -20n - 9 }}}
{{{ 7*(-1/3) = -20*(-1/3) - 9 }}}
Multiply both sides by {{{ 3 }}}
{{{ 7*(-1) = (-20)*(-1) - 9*3 }}}
{{{ -7 = 20 - 27 }}}
{{{ -7 = -7 }}}
OK