4.8-x+6.3=7.2
问题描述：
4.8-x+6.3=7.2
答
4.8-x+6.3=7.2
-x=7.2-6.3-4.8
-x=-3.9
x=3.9
4.8-x+6.3=7.2
4.8-x+6.3=7.2
-x=7.2-6.3-4.8
-x=-3.9
x=3.9