{[（77*78-6）-5679]/107+30}*37=[(80x78-3x78-6-5679)/107+30]x37=[(6240-234-6-5679)/107+30]x37=[(6240-240-6000+321)/107+30]x37=(321/107+30)x37=(3+30)x37=3x37+30x37=111+1110=1221
