54-24:6+40= 90-21+42:7= 35-30:5+25=
54-24/6+40=54-4+40=90 90-21+42/7=69+6=75 35-30/5+25=35-6+25=29+25=54
54-24:6+40=90 90-21+42:7=75 35-30:5+25=54