①5x+7=28
②6.6x+5.4x=19.2
③4x-0.7 =8.1
④12+5x=72
⑤7.5+2.5x=15
⑥x-0.85x=3
76x=136.8 9.2+0.8x=11.6 7x+3x-25=73
6x-18=120 x÷9=12.6 *3.8x-x=0.56