Question 57745
-9a+-12=8+-4
-9a-12=8-4
-9a-12=4
-9a-12+12=4+12
-9a=16
{{{-9a/-9=16/-9}}}
{{{highlight(a=-16/9)}}}
:
Check by substituting -16/9 in for a and see if both sides =:
{{{-9(-16/9)+-12=8+-4}}}
{{{-(-16)-12=8-4}}}
{{{16-12=8-4}}}
{{{4=4}}}  We're right!!!
Happy Calculating!!!