4.8x+13.9-61=10.5
问题描述：
4.8x+13.9-61=10.5
答
4.8X+13.9 - 61 = 10.5
慢慢移项
4.8X+13.9= 10.5+ 61
4.8X= 71.5-13.9
4.8X = 57.6
X= 57.6 / 4.8
X= 12