Question

给我一步一步解方程!一部一部!5%x-5%x*4/5=202x=（280+x）2/7+2807/9x=5/6(x-3)2

Answer 1

5%x-5%x*4/5=20

5%x-4%x =20

1%x =20

x = 2000

2x=（280+x）2/7+280

2x = 80 + (2/7)x +280

(12/7)x =360

x = 210

7/9x=5/6(x-3)

42x =45(x-3)

42x =45x - 135

3x = 135

x =45

2/3x-21=3/8x

16x - 504 = 9x

7x =504

x =72