Question

Ajudem-me por favor:
3(1/3-x)-(-2x+7)=-3
U=Q

Answer 1

3(1/3-x)-(-2x+7)=-3 U=Q

(3/3-3x)+2x-7=-3

1-3x+2x-7=-3

-x=-3+7-1

-x=3

x=-3

v={x∈ Q/ x= -3}