5x+85=200 18-2.5x=15 (x+2.4)×6=30

问题描述:

5x+85=200 18-2.5x=15 (x+2.4)×6=30

5x+85=200
5x=200-85
5x=115
x=23
18-2.5x=15
2.5x=3
x=1.2
(x+2.4)*6=30
6x+14.4=30
6x=15.6
x=2.6