6a+11a = 17a-11b-2b = -13b13a-4a+17b-56 = 9a+17b-560.2x-0.2x+1.7y-0.2c = 1.7y-0.2c1.3c+2-0.2-1.2-0.2c = 1.3c-0.4-0.2c = 1.1c-0.4
6a+11a = 17a
-11b-2b = -13b
13a-4a+17b-56 = 9a+17b-56
0.2x-0.2x+1.7y-0.2c = 1.7y-0.2c
1.3c+2-0.2-1.2-0.2c = 1.3c-0.4-0.2c = 1.1c-0.4