Question

解下列方程3=11-X;3-X=7;2X+3=X-1;2X-1=-X+5;11/9X+2/7=2/9X-5/7;1/2X

Answer 1

3=11-X

X=11-3

X=8

3-X=7

X=3-7

X=-4

2X+3=X-1

2X-X=-1-3

X=-4

2X-1=-X+5

2X+X=5+1

3X=6

X=2

11/9X+2/7=2/9X-5/7

X=-1

1/2X-1/2+1=X-1

1/2X=3/2

X=3

12(2-3X)=4X+4

40X=20

X=1/2