(1)3.5x+x-14=18.4
4.5x=32.4
x=7.2
(2)2.7*2-1.5x=0
1.5x=5.4
x=3.6
(3)13x-6.8x+x=46.8
7.2x=46.8
x=6.5
(4)17.5-0.5x=12.7
0.5x=4.8
x=9.6
(5)5x-1.4x=54
3.6x=54
x=15