12-[tex] \frac{4}{5}(x+15)=4 [/tex]
-[tex] -\frac{4}{5} (x+15)=4-12 [/tex]
-[tex] -\frac{4}{5} (x+15)=-8
x+15 = -8×[tex]- \frac{5}{4} [/tex]
x+15=10
x= 10-15
x=-5
