Question

5X+3（9-x)=37 列竖式解方程42x+35(6-x)=231

Answer 1

5X+3（9-x)=37

5x+27-3x=37

5x-3x=37-27

2x=10

x=5

42x+35(6-x)=231

42x+35*6-35x=231

42x-35x=231-35*6

7x=231-210

7x=21

x=3