2x+0.4x=48(并检验) 8x-x=14.7 35x+13x=9.6

2x+0.4x=48
(2+0.4)x=48
x=48/2.4
x=20
(并检验)
2×20+0.4×20=40+8=48
8x-x=14.7
(8-1)x=14.7
x=14.7/7
x=2.1
35x+13x=9.6
(35+13)x=9.6
x=9.6/48
x=0.2
5(x+3)=35
x+3=35/5
x+3=7
x=7-3
x=4
x+3.7x+2=16.1
(1+3.7)x=16.1-2
4.7x=14.1
x=14.1/4.7
x=3
14x+3x-1.2x=158
(14+3-1.2)x=158
15.8x=158
x=158/15.8
x=10