Can someone me with 7,8,9, and 10? i don't get these problems.

7) 5x + 16.50 = 59
           -16.50    -16.50 (Subtract 16.50 from both sides)
                 5x = 42.50
                 /5      /5       (Divide by 5 on both sides)
                    x = $8.50

8) 4 + 3x = 67
      -4         -4
           3x = 63
            /3     /3
             x = 21 stuffed animals

9) 20 + 3x = -4
      -20         -20
             3x = -24
              /3     /3
               x = -8

10) 18.9 - 2x = 9.9
       -18.9         -18.9
               -2x = -9
               /-2     /-2
                  x = 4.5

(I'm not completely sure on number 10, but I hope this helps!)