Question 646106
{{{a^2=7a}}}

{{{a^2-7a=0}}}

{{{a(a-7)=0}}}

solutions:

{{{a=0}}}
and
if {{{a-7=0}}}, then {{{a=7}}}


{{{ graph( 600, 600, -10, 10, -15, 10,x^2-7x) }}}