-3/5(3a+4)=7
multiply each side by -5/3 to get rid of the fraction
-5/3 * -3/5 (3a+4) =7 *-5/3
(3a+4) = -35/3
subtract 4 from each side
3a +4-4 = -35/3 -4
3a = -35/3 -12/3
3a = -47/3
divide each side by 3
a = -47/3 /3
a = -47/9
