3.5X-6.88=4.2 3.5x （5-1/2X)=10.5 3/4+1/2X÷2=1/2 怎3.5X-6.88=4.23.5x （5-1/2X)=10.53/4+1/2X÷2=1/2怎么写?

3.5x-x=7.x=? 3.5x-x=17.5 x+12.5=3.5x x+12.5=3.5x 4.5X-X=3.5 x+12.5=3.5x x+3.5x=9. 3.5x=x-3.65 x-30=x/3.5 3.5X-X=32 6.5x-4.5x=93.6-6.5x-3.5x 3.5x-0.8x 求x 的值.x +3.5x =9.9;4.25x -x =4.55;10x -2.7x =58.4;6.8x +3.2x =100 3.5+2.1x=4.2, 3.5:x=5:4.2 解方程x/[x/3.5+(x-45)/3.5]=2 3.5X-4.2=5.5X这个方程怎么解 3.5x-14.5-3.5=x