①12+0.4x=16
②5x-x=4.4
③4x÷1.2=0.5
④4x+8x=72
⑤1.3x-4×0.8=3.3
⑥x-5.6+4.4=6.5
x+78=91 5x+28=48
x÷5=7.5 8x÷5=1.6