25x + 5x = 30x8m + m = 9m12y - 3y = 9y21a - 20a = a(8 + m) ÷ 2 = 4 + (m/2)10(y + 11) = 10y + 110(a - 15) 4 = 4a - 609*(15 - c) = 135 - 9c
25x + 5x = 30x
8m + m = 9m
12y - 3y = 9y
21a - 20a = a
(8 + m) ÷ 2 = 4 + (m/2)
10(y + 11) = 10y + 110
(a - 15) 4 = 4a - 60
9*(15 - c) = 135 - 9c