４:x+7=36x+43=92 29+y=35 y=69+31 x=36-7 x=92-43 y=35-29 y=100 x=27 x=49 y=6 5.x+5=32 x-12.4=23.6 x=32-5 x=23.6+12.4 x=27 x=36 3x=120 x-4

４:x+7=36x+43=92 29+y=35 y=69+31 x=36-7 x=92-43 y=35-29 y=100 x=27 x=49 y=6 5.x+5=32 x-12.4=23.6 x=32-5 x=23.6+12.4 x=27 x=36 3x=120 x-4