0.5x+20=3*(65-x)

0.5x+20=3*(65-x) :(0.5x+20)+x+(3x-80)=507 x-0.3x-0.5x=20 3*(65-X)=X/2+20 X+0.5X=3 X-0.8X=8 x-0.5x=20, x-2=(104-x)+2 6x-59=10x-75 (x+10)+(x-15)=280-x4（x-62)=x-38 60x-40=(60+20)*(x-5) 32x+32*0.5-25x+64x=24x+496-49x x+15=3*(109-x ) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(2x+5)=17(x-2)-4(2x-1) (13x+8)/3=5x-1x-60=2[(3561-x)+100]+1 (x+9)+12=2[(x-9)-1 x-3(20-x)=3x-7(9-x) 4x-3x(20-x)=4求x 4x-3x(20-x)=5x 4x-3x(20-x)=5x-7x(20-x) 4x-3x(20-x)=5x-7x(20-x)的解法 2x(x-1)-x(3x+2)=(-x-1)(x+6)-20 解方程X(X+1)-X(X-3)=2(X+1)(X-1)+20 x(x+1)²-x(x²-3)-2(x+1)(x-1)=20 20+4x=6x-24 3(3x-2)=10-0.5(x-3.5) (X+4)/0.2-(X-3)/0.5=0.2 x-(x-1)/6=3-(x+2)/3 x/12-(2x-1)/20={(3x+4)/8}-1 2%x-5+5%x=20%0.13(x-1)=0.07(x+1) x/2-x/6+x/8-x/10=1-1/3+1/4-1/5 5*(x-2)=4*(x+3) 2x+（50-x）*4=140 3x-(8-x)=20*4 200x=(x-0.5)*240 12x+34=14*(x-4)