0.3x+ 140-0.7x= 108

0.3x-0.7x= 108- 140

0.4x=32

x=80

10. Original formula × 1 pricing.

5(3x+ 1.5)-4(2x- 1)= 8(x+ 1)- 1

15x+7.5-8x+4 = 8x+8- 1

8x+8x- 15x = 7.5+4-8+ 1

x=4.5

1 1.

Original formula × 150

( 1) 15 { 1/3[ 1/5(x-2)+ 1]+2 } = 150

5[ 1/5(x-2)+ 1]+30 = 150

x-2+5+30= 150

x= 150+2-5-30

x= 1 17

(2) get the original formula ×30.

15[4x/3-( 1/5-2x/3)]= 6x

20x- 15( 1/5-2x/3)= 6x

20x-3+ 10x=6x

20x+ 10x-6x=3

24x=3

x= 1/8