2x＋48＝158
2x＝158-48
X=55
68-5x＝23
-5x = 23 - 65
x=6.4
2.9x + 0.28 = 6.08
2.9x = 6.08 - 0.28
X=2
3x - 0.4*3 = 5.7
3x = 5.7 + 1.2
X=2.3
6x + 5x＝13.2
11X =13.2
X = 1.2
2.3x - x ＝7.8
1.3x = 7.8
X = 6
12.3x－8.7＝64.8
12.3X=64.8 + 8.7
x=5.98
0.6x＋1.7x＝20.7
2.3x = 20.7
x=9
1.8x＋1.1x＝33.35
2.9x=33.35
x=11.5
12.9x－3.6x＝7.254
9.3x=7.254
x=0.78