Question

21. 5(2y+4)-(10y-16)=6-4y

20. 8y-5(2y-3)=4(y-3)+18

19. 3(2x-3)-2(x+1)=x-3

18. 4x+3(x-2)-(5-4x)=0

Answer 1

21. 5(2y+4)-(10y-16)= 6-4y
    = 10y+20-10y-16 =6-4y
    =(10y-10y)+(20-16) =6-4y
     4=6-4y
    4-6= -4y
    -2=-4y
     y= 1/2

20.8y-5(2y-3) = 4(y-3)+18
     =16y+15=4y-12+18
    =16y+15=4y+6
    =16y-4y=6-15
    =12y/12=9/12 
   y=3/4

19.  =6x-9-2x-2 = x-3
      = 4x -11 =x-3
      =4x-x =-3+11
      = 3x/3 =8/3
      y= 2 2/3

18. = 4x²-6-5-4x = 0
      =4x²-4x-11 = 0
       = (lanjutkan..)