Answer:
a=-27
Step-by-step explanation:
[tex]\frac{a}{3} +(-84)=-93\\\\\frac{a}{3}+(-84)-(-84)=-93-(-84)\\\\\frac{a}{3}+0=-93+84\\\\\frac{a}{3}=-9\\\\3(\frac{a}{3})=3(-9)\\\\a=-27[/tex]
