=> -4x(100-3x(2x X-5):9)= 120-1000 ======>
=> -4x(100-3x(2x X-5):9)=-880. ======>
= >(100-3x(2x X-5):9)= -880: (-4) ======>
= >100-3x(2x X-5):9= 220. ======>
=>-3x (2x X-5):9=220-100
=>-3x (2x X-5):9=120
=>-3x (2x X-5)=120x9
=>-3x (2x X-5)=1080
=>-3x (2x X-5)=1080
=> -6x +15 =1080
= >-6x=1065====>x= -177.5