(Full score: 100, time: 60 minutes)

3x+9 = 12 18(x-2)= 27 12x = 320+4x

X-7.7=2.85 5

320=45+6X

52-2x= 15 13

15x =30 3

X-3X = 68 4X-0.6X = 8÷X = 1.3 X+9 = 36 7(X+ 10 = 5 X+8.6 = 9.4 X+8.3 = 19.7 X-2)= 7

5.37+x=7.47 1

1.8+2x=6 420-3

0.5x+9=40 6

5×3-x = 8 40-85÷3x = 5 x = 170 3(x+3x = 36 1.5x = 5 30÷x = 85 x+5)= 18 x+6 = 3x x÷5 = 2 1

Second, improve the class equation.

4(4x- 1)=3(22-x)

x = 1.6 9.8-2x=3.8

x+3x = 70 ^ 3(x+3)= 50

7(2x-6)=84

(22-x)+2 = 68x 8 7(x+2)= 5x+60 20-8x)÷3 = 2x+ 1 12÷8x = 3 x-6x+30 = 12x+ 15 240÷(x-7)= 30(6x-40)÷8 = 5x-8 2 1+4x)×2 = 65438

8x- 15×6 = 3x-20(2x+7)×2 = 4x+ 14