tolong mas di bantu sama caranya ya,trmksh

800=(5x - 15) + 3/5 (5x - 15) + 2/3.3/5(5x - 15)
800=5x-15+3x-9+2x-6
800=10x-30
830=10x
x=83

C=2/3.3/5(5.83 - 15)
=2/5.(415-15)
=2/5.400
=160m2