Question

若4x+2/5-5x-7/10=1与6x+1=a(3x+2)-1同解,求a的值.

Answer 1

4x+2/5-5x-7/10=1

4x-5x=1-2/5+7/10

-x=13/10

x=-1.3

将x=-1.3代入6x+1=a(3x+2)-1

-1.3*6+1=a(-1.3+2)-1

a=(1-1.3*6+1)/(-1.3+2)

a=-58/7