① ②12y+3.2 = 6.8 ③x÷8=
3x+5x=9.6 2x+8=19 4x+2.5×6=71
5x-1.2=0.8
2.75x-1.5x=8.75
1.5﹣0.9x=0.6 2x-= 5x+16.2=53.8