x+5*4=40 x=20
2x+5*4=40 x=10
4x-18\3=30 x=9
4x-18\3=30 x=9
5x+35\7=40 x=7
2.4\0.3+6x=50 x=7能列出那个解的过程吗？x+5*4=40x=40-5*4x=40-20x=202x+5*4=402x=40-5*42x=20x=20/2 x=104x-18\3=304x=30+6 4x=36x=36/4 x=95x+35\7=405x=40-35/75x=35x=35/5x=72.4\0.3+6x=506x=50-86x=42x=42/6x=7