32.8-x=23.2
x=32.8-23.2
x=9.6
x+3x=14.4
4x=14.4
x=14.4÷4
x=3.6
(x+18.3)×2=67.8
2x+36.6=67.8
2x=31.2
x=15.6
最后一题没求知数,是不是写漏了