4(3-7c)+10=-10c-140.
6m-72=4m-50

4(3-7c)+10=-10c-140.12 - 28c + 10 = -10c - 14022 - 28c = -10c - 140-28c + 10c = -140 - 22-18c = -162c = 162 : 18c = 96m-72=4m-506m - 4m = -50 + 722m = 22m = 22 : 2m = 11