①24.8-x=7.2
②6x+21x=540
③1.6x÷0.5=25.6
④9x-4.5=7.2
⑤x÷5.6=1.4
⑥3.5×0.6+x=7.5
①9x=27.27
②15x-x=1.4
③7.8x+3.2x=24.2
④8x÷12=15
⑤2x-7.2=6.8
⑥5.2+2x=16.8