(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。(5-2)/2 - (4+x)/3 =1。x/3 -1 = (1-x)/2。(x-2)/2 - (3x-2)/4 =-1。11x+-2x=100-9x。15-(8-5x)=7x+(4-3x)。3(x-7)-2[9-4(2-x)]=22。3/2[2/3(1/4x-1)-2]-x=2。2(x-2)+2=x+1。