8.4 - 0.6(x+2) = 3(0.2x-2.4)
去括号:
8.4 - 0.6x -1.2 = 0.6x - 7.2
移项:
- 0.6x -0.6x = - 7.2- 8.4 + 1.2
合并同类项:
- 1.2x = -14.4
两边同除以未知数的系数:
x = -14.4/(-1.2) = 12
8.4 - 0.6(x+2) = 3(0.2x-2.4)
去括号:
8.4 - 0.6x -1.2 = 0.6x - 7.2
移项:
- 0.6x -0.6x = - 7.2- 8.4 + 1.2
合并同类项:
- 1.2x = -14.4
两边同除以未知数的系数:
x = -14.4/(-1.2) = 12