Question 8735
You've done fine as so far so let's see the next step.

{{{(4/5)x = -6}}} Multiply both sides by the multiplicative inverse of (4/5), that's (5/4)

{{{(5/4)(4/5)x = (-6)(5/4)}}}

{{{x = -30/4}}}

{{{x = -7.5}}}