-4x-3x-9x = -1 (4x+3x+9x) = -1 16x = -16x
1,3a-2a+6,5a = 1,3 (a-2a+6,5a) = 1,3 5,8a = 7,54a
2,1b+3,5b-4,7b = 2,1 (b+3,5b-4,7b) = 2,1 -0,2b = -0,42b
-4x-3x-9x = -1 (4x+3x+9x) = -1 16x = -16x
1,3a-2a+6,5a = 1,3 (a-2a+6,5a) = 1,3 5,8a = 7,54a
2,1b+3,5b-4,7b = 2,1 (b+3,5b-4,7b) = 2,1 -0,2b = -0,42b