7(2x- 1)-3(4x- 1)= 4(3x+2)- 1；

(5y+ 1)+( 1-y)=(9y+ 1)+( 1-3y)；

20%+( 1-20%)(320-x)= 320×40%

2(x-2)+2=x+ 1

2(x-2)-3(4x- 1)= 9( 1-x)

x/3 -5 = (5-x)/2

2(x+ 1)/3 = 5(x+ 1)/6- 1

( 1/5)x+ 1 =(2x+ 1)/4