ajuttoooooorrrrrr vaaaaaaa rooooogggg mult! ex 4

2/3+1/3×(3-7x)=x
2/3+1-7/3x=x
/2+3/3-7/3x=x
5/3-7/3x=x
3×5/3-3×7/3x=3x
5-7x=3x
-7x-3x=-5
-10x=-5
x=5/10, x=1/2.............