1、解方程。
2x-16=5.6
2x-16+16=5.6 +16
2x=21.6
X=10.8
3.2x+1.5×2=12.6
3.2x+3=12.6
3.2x+3-3=12.6-3
3.2x=9.6
3.2x÷3.2=9.6÷3.2
x=3
5（x-2.5） =5.5
5（x-2.5）÷5 =5.5÷5
x-2.5=1.1
x-2.5+2.5=1.1+2.5
X=3.6
3.6（5-x）=7.2
3.6（5-x）÷3.6 =7.2 ÷3.6
5-x =2
5-x+x =2+x
5=2+x
5-2=2+x-2
X=3
（x+6.9）÷4=2.5
（x+6.9）÷4×4=2.5×4
x+6.9=10
x+6.9-6.9=10-6.9
x=3.1
（2x-4.6）÷6=1.8
（2x-4.6）÷6×6=1.8×6
2x-4.6 =10.8
2x-4.6+4.6 =10.8+4.6
2x =10.8+4.6
2x=15.4
2x÷2=15.4÷2
x=7.7
(1)2x+8=16，x=4 (2)x/5=10,x=500 (3)x+7x=8,x=1 (4)9x-3x=6,x=1 (5)6x-8=4,x=2 (6)5x+x=9,x=3/2 (7)x+8=6x,x=8/5 (8)4/5x=20,x=25 (9)2x-6=12,x=9 (10)7x+7=14,x=1 (11)6x-6=0,x=1 (12)5x+6=11,x=1 (13)2x-8=10,x=9 (14)1/2x-8=4,x=24 (15)x-5/6x=7,x=42 (16)3x+7=28,x=7 (17)3x-7=26,x=11 (18)9x-x=16,x=2 (19)24x+x=50,x=2 (20)6/7x-8=4,x=14 (30)3x-9=30,x=13